Blog
Each new post has a named author, dates, sources and at least one number from our own campaigns. Prices and limits come from the fact register.
223 posts
Latest · Outbound strategy and playbooks
How to grade target accounts A, B, C, D or X by fit with your ideal customer profile before you write to anyone: the criteria, a scoring sheet you can copy, what to do with each tier and where it goes wrong.
Viktorio Shopov
· · 8 min read
Four posts that answer the questions people ask us first.
Research and benchmarks
7 min read
Invitation limits, acceptance rates, follow ups and the settings that keep a LinkedIn account in good standing.
LinkedIn outreach
How to turn LinkedIn Event attendees into leads: who can see the attendee list, how organizers and attendees may message, the 1,000 invitations a week cap, why group messages are blocked, and follow up ideas that fit the event.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
How to use LinkedIn Group members and event attendees as a lead source: what LinkedIn says about messaging group members, a method that starts with a shared interest, and message examples.
Asen Levov
· · 8 min read
LinkedIn outreach
Sales Navigator plans and prices from LinkedIn's own page (read 25 October 2026): Core, Advanced and Advanced Plus, monthly vs annual cost, the free trial rules, and when it pays off.
Viktorio Shopov
· · 8 min read
Where lead data comes from, how to build a list that fits your buyer and which signals are worth acting on.
Leads, data and signals
Where business phone numbers in a B2B database come from, how to judge their quality, what the GDPR and UK rules say about using them, and how to use a number you find without ringing it.
Viktorio Shopov
· · 8 min read
Leads, data and signals
How to clean a CRM CSV before you import it into an AI SDR: required columns, headers the importer recognises, duplicates, LinkedIn URLs, encoding and a safe three row test run. Based on the Sellinger CSV importer.
Viktorio Shopov
· · 8 min read
Leads, data and signals
How to export your LinkedIn connections with LinkedIn's official data export, what the file does and does not contain, how to clean the CSV, and how to import it into a CRM or Sellinger without duplicates.
Viktorio Shopov
· · 8 min read
What an AI SDR does, what it costs, how to judge one and where it falls short, with numbers from our own campaigns.
AI SDR
AI SDR, AI sales agent and AI BDR are mostly marketing labels. How vendors use them, what the human SDR and BDR roles meant, and a checklist of what to compare instead of the name.
Viktorio Shopov
· · 7 min read
AI SDR
What to put in the knowledge base of an AI sales agent before it writes to anyone: twelve facts, how to write each one, what to leave out, and how to test that the agent answers from them.
Viktorio Shopov
· · 8 min read
AI SDR
How to test an AI sales agent before launch: pick a channel, play the lead or let an AI buyer play it, rate the replies, and publish fixes only when you are happy. Based on the Sellinger Test page.
Viktorio Shopov
· · 8 min read
Cold email length, sender rules, deliverability and what still earns replies.
Email outreach
What a cold email bounce rate is, why Google and Yahoo give no exact bounce threshold, how to read hard and soft bounces, and a step by step fix for a high rate.
Asen Levov
· · 8 min read
Email outreach
Why the open rate of a cold email no longer tells you who read it, what Apple Mail Privacy Protection and image blocking do to the number, and five measures to track instead, with a worked example.
Asen Levov
· · 7 min read
Email outreach
A low cold email reply rate has five usual causes. Check them in order: deliverability, list, offer, copy, follow ups. Includes a diagnostic table and a worked example.
Asen Levov
· · 8 min read
Answering the people who write to you first, quickly and in your own voice.
Inbound messaging
What an Instagram AI agent does for a B2B business, which jobs are safe, what Meta's messaging rules say about the 24 hour window and human takeover, and how Sellinger's daily outbound limit works.
Asen Levov
· · 8 min read
Inbound messaging
Set up an AI live chat widget on a B2B website: create the widget, write the greeting, choose qualifying questions, set the handoff and business hours, and paste one script tag. Based on the Sellinger live chat settings.
Viktorio Shopov
· · 8 min read
Inbound messaging
How to write a speed to lead SLA for inbound leads: pick the clock start and stop, set tiers by source and hours, measure the median and the tail, and decide what happens when the SLA is missed.
Viktorio Shopov
· · 8 min read
Plans for who to contact, what to say and how to follow up, written as steps you can copy.
Outbound strategy and playbooks
Outbound vs inbound lead generation: definitions from HubSpot, a decision table by company stage, the costs of each, and why most teams should start with outbound and add inbound.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
How to move from Apollo to Sellinger: export saved contacts to CSV, carry over opt outs, import into Sellinger, reconnect channels and run both tools safely for two weeks. What moves, what does not, and what to check.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
How to move LinkedIn outreach from HeyReach to Sellinger: export lists, sort leads by invitation status, reconnect LinkedIn accounts without running two tools on one account, and protect people already in conversation.
Viktorio Shopov
· · 8 min read
LinkedIn growth and content
How to use an AI LinkedIn post generator well: a free prompt template, a seven point edit checklist, what LinkedIn's community policies say, and how Sellinger's post wizard generates, refines and staggers posts.
Asen Levov
· · 8 min read
AI SDR
AI SDR, AI sales agent and AI BDR are mostly marketing labels. How vendors use them, what the human SDR and BDR roles meant, and a checklist of what to compare instead of the name.
Viktorio Shopov
· · 7 min read
AI CRM
How to run an AI SDR alongside Salesforce when there is no built in connector: split the roles, push booked meetings through a REST API and webhooks, or review by hand, with the limits of each.
Asen Levov
· · 8 min read
Leads, data and signals
Where business phone numbers in a B2B database come from, how to judge their quality, what the GDPR and UK rules say about using them, and how to use a number you find without ringing it.
Viktorio Shopov
· · 8 min read
AI CRM
How to choose a CRM when you run outbound for several clients: what to require, four options with prices as listed on their own pages on 25 October 2026, and where Sellinger's built in CRM fits.
Asen Levov
· · 8 min read
AI CRM
Which CRMs bring WhatsApp, LinkedIn and email into one inbox? What HubSpot, Pipedrive and Zoho document for WhatsApp, what they say nothing about for LinkedIn, and where Sellinger's built in CRM differs. Sources and dates included.
Asen Levov
· · 8 min read
Leads, data and signals
How to clean a CRM CSV before you import it into an AI SDR: required columns, headers the importer recognises, duplicates, LinkedIn URLs, encoding and a safe three row test run. Based on the Sellinger CSV importer.
Viktorio Shopov
· · 8 min read
Email outreach
What a cold email bounce rate is, why Google and Yahoo give no exact bounce threshold, how to read hard and soft bounces, and a step by step fix for a high rate.
Asen Levov
· · 8 min read
Email outreach
Why the open rate of a cold email no longer tells you who read it, what Apple Mail Privacy Protection and image blocking do to the number, and five measures to track instead, with a worked example.
Asen Levov
· · 7 min read
Research and benchmarks
Cold outreach statistics for 2026 with the source, date and sample size of every number: LinkedIn acceptance and reply rates, cold email reply rates, deliverability rules, open rate limits and WhatsApp pricing rules.
Viktorio Shopov
· · 8 min read
Leads, data and signals
How to export your LinkedIn connections with LinkedIn's official data export, what the file does and does not contain, how to clean the CSV, and how to import it into a CRM or Sellinger without duplicates.
Viktorio Shopov
· · 8 min read
Leads, data and signals
What LinkedIn documents for seeing and exporting followers of a Page or a profile, what the Page analytics export contains, why the Pages Data Portability API needs member consent, and what to do with followers instead.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Legitimate free B2B lead sources: LinkedIn search, company websites, public registers such as Companies House and OpenCorporates, events and communities. What each gives you, how to qualify it, and where free stops.
Viktorio Shopov
· · 8 min read
Agencies and whitelabel
GoHighLevel plans and prices as listed on its page, what a white label AI SDR program covers, how they differ for an agency selling outbound, and when to use one, the other or both.
Viktorio Shopov
· · 8 min read
Build vs buy and DIY
What a GTM engineer does according to job ad research, when hiring one makes sense, and when an agent platform is the cheaper route. With a decision table and a cost checklist.
Asen Levov
· · 8 min read
Safety and compliance
How to answer a prospect who asks where you got their details: the source, what you hold, the purpose, the right to object, and the GDPR Article 14 notice, with reply examples and a checklist. Not legal advice.
Asen Levov
· · 8 min read
Email outreach
A low cold email reply rate has five usual causes. Check them in order: deliverability, list, offer, copy, follow ups. Includes a diagnostic table and a worked example.
Asen Levov
· · 8 min read
Inbound messaging
What an Instagram AI agent does for a B2B business, which jobs are safe, what Meta's messaging rules say about the 24 hour window and human takeover, and how Sellinger's daily outbound limit works.
Asen Levov
· · 8 min read
Safety and compliance
What Meta publishes about Instagram messaging limits, the 24 hour window and API rate limits, what 'action blocked' usually means, and how to judge whether DM automation is safe for your account.
Viktorio Shopov
· · 8 min read
Safety and compliance
A plain English look at whether scraping LinkedIn is legal: what the hiQ v. LinkedIn court rulings decided, what LinkedIn's User Agreement forbids, and what GDPR adds. Not legal advice.
Asen Levov
· · 8 min read
AI SDR
What to put in the knowledge base of an AI sales agent before it writes to anyone: twelve facts, how to write each one, what to leave out, and how to test that the agent answers from them.
Viktorio Shopov
· · 8 min read
AI CRM
What lead routing is, the common methods (round robin, territory, score, stage, channel), how to design simple rules, and how Sellinger's routing rules pick the first channel for each lead.
Viktorio Shopov
· · 8 min read
Leads, data and signals
How to turn people who like or comment on LinkedIn posts into leads: which engagers are worth contacting, what LinkedIn exposes, the rules on scraping, and how to write the first message.
Asen Levov
· · 8 min read
LinkedIn growth and content
What LinkedIn has published about how its feed ranks posts, which popular claims are unverified, and which outbound numbers you should track instead of chasing reach.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Which LinkedIn buying signals exist, what LinkedIn lets you see for each, how fresh and how strong it is, and how to turn it into a first line. With sources from LinkedIn's own help pages.
Asen Levov
· · 8 min read
LinkedIn outreach
How to turn LinkedIn Event attendees into leads: who can see the attendee list, how organizers and attendees may message, the 1,000 invitations a week cap, why group messages are blocked, and follow up ideas that fit the event.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Five ways to get LinkedIn leads without a scraper: the official data export, Sales Navigator, a search import, intent signals and a contact database. What each gives you, what it costs in risk, and how to choose.
Viktorio Shopov
· · 8 min read
Inbound messaging
Set up an AI live chat widget on a B2B website: create the widget, write the greeting, choose qualifying questions, set the handoff and business hours, and paste one script tag. Based on the Sellinger live chat settings.
Viktorio Shopov
· · 8 min read
Build with AI (MCP and Claude)
MCP server or API for sales work: what each one is, when a person asking Claude or ChatGPT needs MCP, when a script or another system needs the API, and how Sellinger offers both.
Viktorio Shopov
· · 7 min read
Leads, data and signals
A method to score buying signals by results: one source per campaign, people messaged as the denominator, meetings per 100 as the real test, how many people you need, and our own account's numbers.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
How to use LinkedIn Group members and event attendees as a lead source: what LinkedIn says about messaging group members, a method that starts with a shared interest, and message examples.
Asen Levov
· · 8 min read
Outbound strategy and playbooks
Outbound vs inbound lead generation: definitions from HubSpot, a decision table by company stage, the costs of each, and why most teams should start with outbound and add inbound.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
Sales Navigator plans and prices from LinkedIn's own page (read 25 October 2026): Core, Advanced and Advanced Plus, monthly vs annual cost, the free trial rules, and when it pays off.
Viktorio Shopov
· · 8 min read
Leads, data and signals
What Seamless.AI says about its credits and plans, where credit based contact data tools differ, a checklist for choosing an alternative, and where Sellinger's database and enrichment fit.
Asen Levov
· · 8 min read
Leads, data and signals
How to turn a buying signal into a first line: name the event, keep it true, ask for nothing heavy. Six invented before and after pairs for post engagers, hiring, funding, job changes and events, plus a checklist and the data behind observation openers.
Asen Levov
· · 8 min read
Inbound messaging
How to write a speed to lead SLA for inbound leads: pick the clock start and stop, set tiers by source and hours, measure the median and the tail, and decide what happens when the SLA is missed.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
How to move from Apollo to Sellinger: export saved contacts to CSV, carry over opt outs, import into Sellinger, reconnect channels and run both tools safely for two weeks. What moves, what does not, and what to check.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
How to move LinkedIn outreach from HeyReach to Sellinger: export lists, sort leads by invitation status, reconnect LinkedIn accounts without running two tools on one account, and protect people already in conversation.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
How to move from Instantly to Sellinger: download your leads as CSV, use lead status to decide who to carry over, reconnect your mailboxes, handle warm up and unsubscribes, and run a two week cutover without double sending.
Asen Levov
· · 8 min read
Outbound strategy and playbooks
How to move from Outreach to Sellinger: export prospect records with sequence state, check the CRM gap if you run Salesforce, import, reconnect mailboxes and LinkedIn, and cut over in two weeks without contacting anyone twice.
Asen Levov
· · 8 min read
AI SDR
How to test an AI sales agent before launch: pick a channel, play the lead or let an AI buyer play it, rate the replies, and publish fixes only when you are happy. Based on the Sellinger Test page.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Trigify is being retired. What Trigify, Common Room and Warmly do, what they list as prices on their own pages, and how to choose a signal tool for LinkedIn outreach, with Sellinger as one option.
Viktorio Shopov
· · 8 min read
Safety and compliance
What WhatsApp's own policy and terms say about broadcasts and bulk messaging: opt-in, broadcast lists, the official API, enforcement, and a safe way to send to a list.
Asen Levov
· · 8 min read
Inbound messaging
How WhatsApp Business API pricing works in 2026: per delivered message, four categories, the 24 hour window, free entry points, and how it compares with the Business app and connecting your own number.
Viktorio Shopov
· · 8 min read
Inbound messaging
A WhatsApp chatbot follows a script of menus and keywords. A WhatsApp AI agent reads the message, answers from your knowledge base, qualifies and hands over. How they differ, with a test and an honest checklist.
Viktorio Shopov
· · 7 min read
Multichannel sequences
Can you cold message on WhatsApp for B2B? What WhatsApp's own policies say, what gets numbers blocked, when WhatsApp should be the second or last channel, and three honest first messages.
Asen Levov
· · 8 min read
Inbound messaging
How to use WhatsApp for business marketing without spamming: the three ways to be on it, a six step strategy, example messages, what Meta charges, and how to measure results.
Viktorio Shopov
· · 8 min read
Agencies and whitelabel
Why clients cancel outbound agency retainers and what to do about it: set expectations on results lag, report booked and held meetings honestly, and use a white label platform to cut delivery cost.
Viktorio Shopov
· · 8 min read
Leads, data and signals
LinkedIn Boolean search for prospecting: supported operators, the order LinkedIn reads them in, worked examples for sales searches, and common mistakes.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for account executives: build pipeline without an SDR using target accounts, several people per account, closed lost deals.
Asen Levov
· · 8 min read
LinkedIn growth and content
LinkedIn outreach for B2B marketers: co-marketing partners, podcast and webinar guests, event invitations and target account programs, plus shared signals.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for business development managers: a playbook for entering a new market, finding partners and opening strategic accounts, research first.
Asen Levov
· · 8 min read
LinkedIn growth and content
How coaches can turn LinkedIn into discovery calls: a clear niche, posts that start conversations, messages to engagers, the link after a yes, honest follow up.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for customer success managers without selling: connect beyond the champion, notice champion moves, prepare renewals and ask for referrals.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for fractional CFOs, CMOs, CTOs and sales leaders: find founders at the stage that needs you, open with a question about it.
Asen Levov
· · 7 min read
LinkedIn outreach
A LinkedIn outreach plan for freelancers: pick a niche, start with people who know you, reach agencies and clients, follow up politely, keep volume low.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for mortgage brokers: build referral partners among estate agents, accountants, planners and HR teams, keeping rates and advice out.
Asen Levov
· · 7 min read
LinkedIn outreach
How nonprofit fundraisers can use LinkedIn to reach corporate partners, sponsors and foundation staff: who to contact, what to ask, and how to follow up.
Asen Levov
· · 7 min read
LinkedIn outreach
LinkedIn outreach for real estate agents without cold pitching homeowners: HR teams relocating staff, local investors, referral partners such as brokers, rules.
Asen Levov
· · 7 min read
Outbound strategy and playbooks
LinkedIn outreach for sales managers: run a team's outreach with account ownership, one set of rules, safe pacing, conversation reviews and honest reporting.
Asen Levov
· · 8 min read
LinkedIn outreach
LinkedIn outreach for SDRs and BDRs, a daily routine: the list, first message, follow ups, handling replies, LinkedIn's limits, and measuring meetings.
Asen Levov
· · 8 min read
LinkedIn outreach
Multithreading B2B deals on LinkedIn: why single threaded deals stall and how to reach two or three people per account without it feeling like a campaign.
Asen Levov
· · 7 min read
Leads, data and signals
Prospect on LinkedIn without Sales Navigator: build lists on a free or Premium account with Boolean search, company pages, post engagement, groups.
Asen Levov
· · 7 min read
Multichannel sequences
Cold outreach in German: tone, Sie or Du, the structure of a short message, consent rules for cold email in Germany, and LinkedIn as the safer channel.
Viktorio Shopov
· · 8 min read
Multichannel sequences
How to write cold outreach in Spanish: usted or tu, Spain versus Latin America, a short structure for LinkedIn and email, Spain's LSSI consent rule, examples.
Asen Levov
· · 8 min read
Multichannel sequences
Hotel group sales by email: how a 68 room hotel won corporate group business by cold email, with the one offer and one question letter and the calendar.
Asen Levov
· · 8 min read
Safety and compliance
LinkedIn API for messaging and sales automation: what official APIs allow and do not, why most tools use the member's own session, and the risk.
Asen Levov
· · 8 min read
Inbound messaging
Qualify inbound leads on WhatsApp, Instagram and chat with five questions: need, timing, size, decision and next step. When to hand over to a person.
Asen Levov
· · 8 min read
AI SDR
A week by week plan for a 30 day AI SDR pilot: set the goal and baseline first, start small in approval mode, measure weekly, decide by day one rules.
Viktorio Shopov
· · 9 min read
Inbound messaging
Speed to lead for Facebook and Google ad leads: answer in five minutes. Why speed matters, sheet pollers every 60 or 300 seconds, the first message.
Viktorio Shopov
· · 8 min read
AI SDR
An AI SDR is software that writes to prospects, follows up, answers replies and books meetings. What it does, where it fails and how to judge one.
Viktorio Shopov
· · 7 min read
Research and benchmarks
Reply rates in our studies sat between 29% and 44.8%. Meetings did not follow. What moved conversion was audience and offer, with data from six campaigns.
Viktorio Shopov
· · 6 min read
Research and benchmarks
Booked, completed and held are three different numbers. How we count our own meetings, why a calendar says completed when nobody came, and a weekly report.
Viktorio Shopov
· · 7 min read
Inbound messaging
At our own hotel, the share of agent replies with a price went from 50% to 92% after one rule. What a good quote contains and when an agent should not quote.
Asen Levov
· · 6 min read
Multichannel sequences
A teardown of follow ups from our own campaigns: a referral ask, the prospect's own words and an easy out worked. Bumps and extra touches added refusals.
Asen Levov
· · 6 min read
Safety and compliance
LinkedIn documents that invitation limits exist but publishes no weekly number. What its help pages say, what vendors claim and what is our own setting.
Viktorio Shopov
· · 6 min read
Safety and compliance
No tool can promise safety. What LinkedIn's rules say about automation, the documented reasons for restrictions, and what we cannot promise.
Viktorio Shopov
· · 6 min read
Agencies and whitelabel
Three ways an agency can price outbound for clients, with a margin model on Sellinger's partner terms: a $500 one time setup, then standard agent prices.
Asen Levov
· · 8 min read
Build vs buy and DIY
An agent run outbound stack: seven layers, which tools sit in each, what it costs at Sellinger list prices, and how many hours a week the owner still spends.
Asen Levov
· · 8 min read
AI CRM
Agentic CRM explained: recording work versus doing it, six jobs an agent does that a traditional CRM leaves to people, the limits, and how to check a claim.
Viktorio Shopov
· · 7 min read
LinkedIn outreach
How an AI agent for LinkedIn researches, writes, follows up, answers replies and books meetings, and the limits it cannot cross. Plain, with our own numbers.
Viktorio Shopov
· · 8 min read
Agencies and whitelabel
How AI automation agencies get clients: five ways, with numbers from running outbound for agencies. Pick one audience, lead with a small step, show a result.
Asen Levov
· · 8 min read
Email outreach
AI cold email writer compared: ChatGPT, Claude and tools. What it does well, where it fails, and how a chat assistant, writing tool and AI SDR differ.
Asen Levov
· · 8 min read
AI CRM
AI note takers with CRM sync: eight things to check before choosing, what a note taker does and does not do for outbound, and where Sellinger and Fireflies fit.
Asen Levov
· · 7 min read
AI SDR
Which levers move reply rates in AI outreach, ranked by a year of LinkedIn data, how Sellinger's config optimization proposes changes, and how to test a change.
Asen Levov
· · 8 min read
Inbound messaging
AI receptionist for inbound messages: what it does, which channels it covers, what to give it so it answers correctly, where a person steps in.
Viktorio Shopov
· · 7 min read
AI SDR
Twelve kinds of reply an AI SDR gets, from ready to book to please stop, with the right response, the wrong one and who should handle it. Examples illustrate.
Viktorio Shopov
· · 9 min read
AI SDR
AI sales agent vs chatbot vs automation: how they differ in what they decide, remember and hand over, a table, five scenarios and the cost of a wrong pick.
Asen Levov
· · 7 min read
AI SDR
Fifteen questions to ask any AI SDR vendor, why each matters, and how Sellinger answers them: data, channels, LinkedIn, approvals, opt outs, pricing, exit.
Viktorio Shopov
· · 9 min read
AI SDR
What an AI SDR cannot do, with numbers: fix a weak offer, close a complex deal, know facts you did not give it, or guarantee a platform will not restrict you.
Viktorio Shopov
· · 8 min read
AI SDR
AI SDR security checklist for buyers: where data lives, sub-processors, whether customer data trains models, DPA, breach notice and deletion, with our answers.
Viktorio Shopov
· · 9 min read
AI SDR
What a small outbound setup costs with an AI SDR: $39 for email, $198 for a LinkedIn agent, $249 for both, plus your time. A price breakdown and a first plan.
Asen Levov
· · 8 min read
AI SDR
AI SDR vendor RFP template: scope, 40 questions in six sections, a weighted scoring sheet and a 30 day trial plan with pass marks. Use it with any vendor.
Asen Levov
· · 9 min read
Inbound messaging
How to answer 'how much does it cost' in cold outreach: give the real number if you have it, say what it includes, ask one question, hand over if unlisted.
Asen Levov
· · 7 min read
LinkedIn growth and content
How automated LinkedIn comments work, why generic comments fail, the limits Sellinger uses for topic comments and pre invite engagement, and what LinkedIn says.
Viktorio Shopov
· · 8 min read
Build vs buy and DIY
You can wire a model to LinkedIn with n8n, Claude or Python. What works, what LinkedIn says about automation, and how DIY compares with a managed cloud tool.
Viktorio Shopov
· · 7 min read
Email outreach
How to A/B test cold emails and LinkedIn messages: one change at a time, random splits, how many sends you need, what to measure and what our own tests showed.
Asen Levov
· · 8 min read
Leads, data and signals
B2B lead database buying guide: a 200 contact test for coverage and accuracy, the cost per usable contact formula, and questions to ask every vendor.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Seven B2B lead generation strategies that still work, from signal based outbound and referral networks to live chat, with real campaign numbers and limits.
Asen Levov
· · 8 min read
Email outreach
What Instantly and Backlinko found about the best day to send cold email, why the differences are small, how time zones matter, and how to test your audience.
Viktorio Shopov
· · 7 min read
Outbound strategy and playbooks
Book meetings from cold outreach: the path from first message to held call, numbers from five real campaigns, when to offer the call, and what to say.
Viktorio Shopov
· · 8 min read
Leads, data and signals
Build an ICP in 30 minutes: let a free tool draft it from your website, then test it against your best customers and one signal. Steps and a template included.
Asen Levov
· · 7 min read
Build vs buy and DIY
The tools for a home built AI SDR are cheap. The cost is hours, upkeep, account risk and compliance. An estimate built from cited public prices.
Viktorio Shopov
· · 9 min read
Build vs buy and DIY
You can build a working CRM with n8n, Claude or ChatGPT in a weekend. What it handles, and where identity, dedupe, permissions, history and opt outs break.
Viktorio Shopov
· · 8 min read
AI CRM
AI can take over data entry, follow ups and logging. It does not replace a system of record. What changes, what stays, and when a small team skips Salesforce.
Viktorio Shopov
· · 7 min read
Build with AI (MCP and Claude)
A chat assistant can research, draft and operate an outreach tool through MCP, but cannot run a campaign by itself. What does the work and where the line sits.
Asen Levov
· · 8 min read
Build with AI (MCP and Claude)
Seven ChatGPT sales prompts for messages, follow ups, objections and call prep, written with facts and rules, plus what worked in our LinkedIn data.
Asen Levov
· · 8 min read
AI CRM
How to choose a CRM for LinkedIn outreach: seven questions on where the conversation lives, what syncs, how duplicates are handled and who owns the history.
Asen Levov
· · 7 min read
Build with AI (MCP and Claude)
Build a lead research agent with Claude Code: what to give it, a four step design, guardrails, what it cannot do, and when to use Sellinger via MCP or the API.
Viktorio Shopov
· · 8 min read
Build with AI (MCP and Claude)
How to use Claude in a sales job: five prompts worth saving, four workflows from research to weekly review, what it cannot do alone, and the Sellinger MCP.
Viktorio Shopov
· · 8 min read
Email outreach
Cold email call to action and sign off: one clear ask, five ask styles compared, sign off wording, signature contents and what Gong and Instantly say.
Viktorio Shopov
· · 7 min read
Email outreach
How to set up cold email sending: when to use a separate domain, how many mailboxes you need, how to warm up, what rotation does, and Google and Yahoo limits.
Viktorio Shopov
· · 8 min read
Email outreach
Cold email setup checklist: SPF, DKIM, DMARC, an unsubscribe mechanism and a ramp. What each does, in what order, how to check it and what Sellinger handles.
Viktorio Shopov
· · 7 min read
Email outreach
Cold email rules every Sellinger email agent follows: facts only from lead data, no invented prices or dates, a stop means stop, plus system checks.
Viktorio Shopov
· · 7 min read
Outbound strategy and playbooks
Cold outreach: what it is, the six parts of a good first message, four examples for LinkedIn and email, the rules that apply, and how to measure it.
Viktorio Shopov
· · 8 min read
Leads, data and signals
People who like or comment on a competitor's LinkedIn posts show interest in your category. Who to contact, what to say, what to leave alone, and the rules.
Viktorio Shopov
· · 8 min read
AI CRM
CRM automation for small sales teams: ten workflows worth building, from lead capture to stale lead audits, with trigger, action and risk of each.
Viktorio Shopov
· · 8 min read
Research and benchmarks
Reply rate, acceptance rate and meetings: the exact definitions, what counts as a reply, why benchmarks differ by 7x and how to compare fairly.
Asen Levov
· · 8 min read
AI SDR
A week by week plan to test an AI SDR in 30 days: honest definitions of reply and meeting, sample sizes, what to check and when to stop. With our own numbers.
Viktorio Shopov
· · 9 min read
Email outreach
How to do email outreach: pick a narrow list, set up the sending domain, write a short message with one ask, follow up with new angles and measure replies.
Asen Levov
· · 8 min read
Email outreach
Published cold email benchmarks range from 0.45% to 4.5% reply rates because they measure different things. What each measured and when cold email works.
Asen Levov
· · 8 min read
Leads, data and signals
Email finder tools: how they turn a name and company into an address, from public sources to catch all checks. Why accuracy claims need your own test.
Asen Levov
· · 8 min read
Email outreach
Email sequences and cadences: how many steps, how many days apart, what each says, when to stop and how a reply ends it. Day by day table, Hotel Pirin letters.
Viktorio Shopov
· · 8 min read
Email outreach
Email verification before you send: what it checks, why catch all domains cannot be fully verified, how bounces hurt a sender, and a routine to verify a list.
Asen Levov
· · 7 min read
Email outreach
Warmup raises volume gradually, but sender reputation also depends on authentication, list quality, complaints and replies. A nine point checklist.
Viktorio Shopov
· · 8 min read
Inbound messaging
Facebook comment reply automation: what to answer, what to ignore, the public reply plus private message pair, Meta's 7 day limit, and testing on one post.
Asen Levov
· · 7 min read
Leads, data and signals
Find companies that just raised funding, opened a role or want a new tool: where to look, how to qualify the signal, and how to write while the news is fresh.
Asen Levov
· · 8 min read
Leads, data and signals
Find decision makers and reach the CEO with six methods, from LinkedIn search to database lookup or asking a gatekeeper. Backed by Green Shield's buyer result.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
Find an email address from a LinkedIn profile: five methods from the contact info box to a database lookup, what each costs, and how to check the result.
Asen Levov
· · 7 min read
AI SDR
Get your first 10 customers with outbound: work backwards to the people you need to message, using our meeting rates by audience. Three scenarios.
Asen Levov
· · 8 min read
LinkedIn growth and content
A four week LinkedIn content calendar for B2B: weekly themes, post types, a table you can copy, how to schedule and stagger posts, and what we do not claim.
Viktorio Shopov
· · 7 min read
Outbound strategy and playbooks
Go to market strategy template: a one page plan with eight parts and a worked example. How to fill each part, which numbers to set, and the outbound campaign.
Viktorio Shopov
· · 8 min read
Email outreach
SPF, DKIM, DMARC, one click unsubscribe and spam rate limits as Google and Yahoo state them, with a checklist for people who send cold email.
Asen Levov
· · 8 min read
Inbound messaging
Handle 'we already have a vendor' in cold outreach: five replies that respect it, how to ask one question, what the Uberwood campaign learned, and the AI rule.
Viktorio Shopov
· · 7 min read
Inbound messaging
What 'not interested' means in cold outreach, when to reply and when to stop, five short replies that keep the door open, and the rule for an AI agent.
Asen Levov
· · 7 min read
AI SDR
A founder's guide: what a first human SDR costs and how long they take to ramp, what an AI SDR costs with your time, and a rule for choosing or combining.
Viktorio Shopov
· · 8 min read
Multichannel sequences
How long should an outreach sequence be? Most replies come in the first touches and later ones bring refusals. Reply share per touch from four real campaigns.
Viktorio Shopov
· · 8 min read
Email outreach
Gong, Instantly and others point to under 100 words. What each study measured, a word count table by purpose, and a structure you can copy.
Asen Levov
· · 7 min read
LinkedIn outreach
How many follow ups to send: they added 32% to 4 times more replies in five campaigns, and refusals rose with each touch. Settings for warm, regulated or cold.
Asen Levov
· · 8 min read
AI SDR
How to give an AI SDR a qualification framework: BANT and MEDDIC written as plain prompts, what to ask first, what to leave to a person, with campaign examples.
Viktorio Shopov
· · 8 min read
Email outreach
A partner survey by email reached 3,940 installers in 111 countries and got 225 answers: four numbered questions, nothing to click, two follow ups.
Viktorio Shopov
· · 8 min read
Leads, data and signals
A B2B lead list starts with a defined buyer, then sources, enrichment, verification and upkeep. The steps, a checklist and what to do before you send.
Viktorio Shopov
· · 8 min read
Agencies and whitelabel
A launch guide for agencies: pick a niche, set the offer and price, onboard clients, connect their accounts carefully and report weekly. Includes a checklist.
Asen Levov
· · 8 min read
Agencies and whitelabel
Three ways an agency can resell outbound without building software: referral, managed service on a platform, or a white label portal. With economics and risks.
Asen Levov
· · 8 min read
Build with AI (MCP and Claude)
How Sellinger paces LinkedIn invitations: daily and weekly limits per account, randomised daily counts with a floor, quiet hours, pending invitation guards.
Asen Levov
· · 8 min read
Build with AI (MCP and Claude)
How we built the Sellinger MCP connector for Claude and ChatGPT: OAuth, 43 tools, thin proxies, scopes, sending guardrails, a pagination trap and logging.
Viktorio Shopov
· · 8 min read
AI SDR
Human in the loop for an AI SDR: approval mode makes it wait for a person before every message. When to use it, when to go automatic, and how to review fast.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
ICP template: ten questions to answer, a simple scoring sheet to grade any lead, and an example of how audience choice changed our LinkedIn outbound results.
Viktorio Shopov
· · 7 min read
LinkedIn outreach
25 LinkedIn InMail subject lines in five patterns, the rules each follows, the length limits, and a way to test them without trusting anyone's reply rate.
Asen Levov
· · 7 min read
LinkedIn outreach
InMail vs connection request vs email: a decision rule for the first touch, with the cost, reach and risk of each, and how Sellinger routes the choice.
Asen Levov
· · 7 min read
Inbound messaging
Instagram DMs for B2B work best as an inbound channel: who writes to you, how to answer in minutes, what an agent can and cannot do, and what we do not claim.
Viktorio Shopov
· · 7 min read
Leads, data and signals
26 intent signal templates in 8 categories, ranked by how closely each ties to a need. A rubric for judging any trigger, our data, and signals to avoid.
Asen Levov
· · 8 min read
Leads, data and signals
Intent signals outreach, your first 30 days week by week: pick two or three templates, set the audience, test messages, read results, and decide what to keep.
Asen Levov
· · 8 min read
LinkedIn outreach
How an AI agent decides between a LinkedIn invite and an InMail: four step routing of daily limit, Open Profile, Premium credit and fallback.
Viktorio Shopov
· · 7 min read
Safety and compliance
A plain English comparison of how the US, EU, UK and Canada treat B2B cold email: consent model, unsubscribe rules and penalties. Not legal advice.
Asen Levov
· · 9 min read
Email outreach
Keep an AI email agent out of auto replies, bounces and mail loops: machine mail wastes sends and inflates reply counts. How to detect it and how we mark it.
Viktorio Shopov
· · 7 min read
Leads, data and signals
Lead enrichment: what it is, which fields are worth paying for, how per lookup pricing works with Sellinger's wallet, and when to enrich before a reply.
Asen Levov
· · 8 min read
AI CRM
Lead management for a small B2B team: the six stages from capture to handover, what software must do, which steps to automate and how handoffs go wrong.
Asen Levov
· · 8 min read
LinkedIn outreach
A simple lead scoring model for LinkedIn outreach with four parts: fit, source, signal and behaviour. How to weight and check them against replies and meetings.
Asen Levov
· · 7 min read
Leads, data and signals
Lead segmentation for outreach: five ways to split a list so each group gets a different message, and why audience beat wording on our own account.
Viktorio Shopov
· · 7 min read
Safety and compliance
LinkedIn account restricted: the restriction types LinkedIn documents, how to read the notice, what to stop doing, how to verify or appeal, and what to change.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
About 4 in 10 invitations are accepted across our customer teams. What vendor studies report, why they disagree, and what really moves acceptance.
Viktorio Shopov
· · 8 min read
LinkedIn growth and content
A small content plan for B2B sellers: treat the profile as a landing page, use four post types, post a few times a week, and let content back up your outreach.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
LinkedIn lead generation: choose the audience, the four sources of leads, the message sequence, a weekly routine and four real examples with their numbers.
Viktorio Shopov
· · 9 min read
LinkedIn growth and content
LinkedIn lead magnet posts: how to write one, which resources people want, the delivery condition, a template, the Sellinger post wizard and how to handle DMs.
Asen Levov
· · 7 min read
LinkedIn outreach
Twenty LinkedIn networking messages in six situations: after an event, a shared interest, a post, an introduction, a thank you and a catch up. Plus length tips.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
LinkedIn outreach for consultants and wealth advisers without a pitch: the peer opener, the reply that matters, compliance questions first, one anonymised case.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
LinkedIn outreach for founders: ask for perspective, not a purchase, start from people already in the conversation, and send the booking link only after a yes.
Asen Levov
· · 8 min read
LinkedIn outreach
LinkedIn outreach for recruiters with an AI agent: who to message, when to use an invite or an InMail, what to say, and what stays with a person.
Asen Levov
· · 7 min read
Multichannel sequences
Three day by day cadences that start on LinkedIn and move to email, with stop rules and how a reply on one channel stops the other.
Asen Levov
· · 9 min read
LinkedIn growth and content
Four vendor studies of the best time to post disagree by hours. What they measured, the origin of the 4-1-1 rule, what to ignore and a decision table.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
LinkedIn Premium types and cost in 2026: plans compared with price ranges from two dated sources, InMail credits a month, and whether it pays off for outreach
Viktorio Shopov
· · 7 min read
LinkedIn growth and content
LinkedIn profile checklist for outbound: photo, headline, about, featured, experience and activity. What a prospect checks before replying, and what we saw.
Asen Levov
· · 6 min read
Safety and compliance
A 15 point LinkedIn safety checklist for AI outreach: account connection, limits, quiet hours, manual invites, acceptance rate and what to do if restricted.
Viktorio Shopov
· · 9 min read
Safety and compliance
What LinkedIn's User Agreement, Professional Community Policies and Help pages say about bots, scraping and extensions, and how cloud and browser tools differ.
Viktorio Shopov
· · 8 min read
Inbound messaging
Three kinds of website chat for a B2B site: human live chat, scripted chatbots and an AI agent that answers, qualifies and books. What each does, how to choose.
Viktorio Shopov
· · 7 min read
Outbound strategy and playbooks
Connect Cal.com or Calendly to an AI outbound agent: when to send the booking link, how to count booked against held meetings, and what we saw ourselves.
Asen Levov
· · 7 min read
Multichannel sequences
A multichannel sequence across LinkedIn, email and WhatsApp with timing, stop rules and what each channel is for. Built from real campaign data and defaults.
Asen Levov
· · 9 min read
Build vs buy and DIY
n8n workflows for outbound: three that hold up (lead intake, reply digest, list cleaning), what they need against duplicates and retries, n8n pricing.
Asen Levov
· · 8 min read
LinkedIn outreach
LinkedIn opener examples: on our own outbound, observation openers out-replied question openers by 10 to 15 points. Why it works, and when to ask.
Viktorio Shopov
· · 7 min read
Agencies and whitelabel
Onboarding checklist for a new outbound client: what to collect, how a client connects LinkedIn safely, which rules to write first, and what to review.
Asen Levov
· · 8 min read
LinkedIn outreach
What a LinkedIn Open Profile is, why it makes an InMail free, how to tell who has one, what it means for outreach planning, and how Sellinger treats them.
Asen Levov
· · 6 min read
Outbound strategy and playbooks
Outbound sales strategy in six decisions: audience, offer, channel, sequence, ownership and measurement. Campaign data on what moved results and when to scale.
Asen Levov
· · 10 min read
Build vs buy and DIY
A layer by layer map of the classic outbound tech stack: which tools an AI SDR replaces, which it leaves in place, and how to count the real cost of each layer.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
Personalisation at scale without sounding like AI: eight patterns, each with a generic version and a real example from our case studies. What to skip.
Viktorio Shopov
· · 9 min read
LinkedIn outreach
Pre invite engagement on LinkedIn: how likes and comments before a connection request work, the defaults and limits in Sellinger, and why no gain is claimed.
Viktorio Shopov
· · 6 min read
LinkedIn growth and content
How to reach 500 or more LinkedIn connections sensibly, why the number matters less than who they are, and what acceptance rates look like on our own account.
Viktorio Shopov
· · 6 min read
AI SDR
The real cost of owning an AI SDR: the subscription is the smallest part. A five part cost model: software, data, sending infrastructure, review time.
Viktorio Shopov
· · 9 min read
Outbound strategy and playbooks
Referral partner outreach on LinkedIn: who to approach, a peer opener with no pitch, asking for introductions, and lessons from a 44.8% reply campaign.
Asen Levov
· · 8 min read
Inbound messaging
How to respond to 'send me more info' in cold outreach: five reply examples, what to send, what never to send, and how to teach an AI agent to handle it.
Viktorio Shopov
· · 7 min read
AI SDR
A cost per meeting model for an AI SDR and a human SDR. Sellinger prices, sourced salary and benefit data, and every estimate labelled as an estimate.
Viktorio Shopov
· · 8 min read
AI CRM
What to track about sales activity, what conversation intelligence adds, which numbers mislead, and how Sellinger records every outbound conversation.
Asen Levov
· · 7 min read
LinkedIn outreach
What Sales Navigator automation means, what LinkedIn's rules say, which actions carry risk, how pacing reduces it, and why no tool can promise no restriction.
Asen Levov
· · 8 min read
LinkedIn outreach
Sales Navigator filters that find buyers: which narrow a list to real buyers, which only look precise, and how a title search compared with an intent list.
Asen Levov
· · 7 min read
Leads, data and signals
Sales Navigator vs a lead database: Navigator finds people on LinkedIn, a database finds contact details and companies. When you need which.
Viktorio Shopov
· · 8 min read
Outbound strategy and playbooks
Six sales prospecting techniques with real campaign numbers: engagement lists, named owner letters, peer openers, one question to owners, surveys and signals.
Asen Levov
· · 8 min read
Outbound strategy and playbooks
Scaling outbound sales: what breaks as volume grows, from audience quality to reply handling and limits. Lessons from our own 27,737 LinkedIn messages.
Asen Levov
· · 8 min read
LinkedIn growth and content
A guide to scheduling LinkedIn posts, choosing times, and staggering one post across several team accounts 15 minutes apart so feeds do not fill up at once.
Viktorio Shopov
· · 7 min read
AI SDR
Set up your first AI SDR: a checklist of twelve decisions in order, from audience, offer and channel to persona, rules, limits, approval and handoff.
Asen Levov
· · 9 min read
Inbound messaging
Shared inbox for WhatsApp, Instagram, Messenger and email: what it does, why a team needs one, how handover to a person works and what to set up first.
Viktorio Shopov
· · 8 min read
AI SDR
AI SDR handoff: an AI SDR answers in minutes, but meetings are lost when the handoff to a person is slow or unclear. When to hand over and the controls.
Viktorio Shopov
· · 8 min read
Inbound messaging
Speed to lead on WhatsApp, Instagram and live chat: the five minute rule. Where inbound leads arrive, what slows the first reply, and the setup that fixes it.
Asen Levov
· · 7 min read
Safety and compliance
Spot LinkedIn invites sent outside your outreach tool: manual and agent invites share one weekly limit. How to find them, why matching is hard.
Asen Levov
· · 7 min read
Email outreach
Cold email subject lines an AI writer should never use, the legal and trust reasons, what studies say about length, and 15 plain subject lines to use instead.
Asen Levov
· · 6 min read
Build with AI (MCP and Claude)
Ten lessons from running AI agents on our own and customers' outreach, with evidence: lists beat wording, follow ups cost goodwill, booked is not held.
Asen Levov
· · 9 min read
Outbound strategy and playbooks
How to write a cold outreach value proposition in four parts, with a before and after, what the Hotel Pirin, Lamothermic and Green Shield campaigns led with.
Viktorio Shopov
· · 7 min read
Leads, data and signals
Waterfall enrichment explained: how a provider cascade finds an email, what it costs in time and money, how a single lookup compares, and how to test it.
Asen Levov
· · 7 min read
Agencies and whitelabel
Weekly client report template for outbound agencies: a one page layout with nine defined metrics, a made up example and notes that stop disputes.
Viktorio Shopov
· · 7 min read
Company and product
A year of our own LinkedIn outbound: 27,737 people messaged, 40% replied, 351 meetings booked. Which choices moved results, which did not, and our mistakes.
Viktorio Shopov
· · 9 min read
AI SDR
A good AI sales reply answers with one real fact, repeats what the prospect said and ends with one next step. Five traits, three real examples, failures.
Asen Levov
· · 7 min read
AI SDR
What an AI SDR does after the first reply, where most value is made or lost: answer, qualify, handle an objection, offer a time, nudge after the link.
Asen Levov
· · 8 min read
Build vs buy and DIY
Home built outbound usually fails in the same five places: limits, state, replies, opt outs and oversight. What each looks like and how a product handles it.
Viktorio Shopov
· · 7 min read
AI CRM
An AI CRM does work, not just record it. What it is, how it differs from a CRM with AI features, and what to check before you pick one.
Viktorio Shopov
· · 7 min read
Leads, data and signals
What is intent data? Evidence that a person or company is looking at a topic now. First vs third party, seven signals that work for outbound, three that do not.
Viktorio Shopov
· · 8 min read
Build with AI (MCP and Claude)
What is MCP for sales? It lets an AI assistant like Claude or ChatGPT use your sales tools directly. What it can and cannot do, and how to judge a connector.
Viktorio Shopov
· · 8 min read
Inbound messaging
A WhatsApp AI agent with human handoff: how it answers, when it hands over and how takeover works. Set up approval mode, opt outs and WhatsApp's own limits.
Asen Levov
· · 7 min read
Multichannel sequences
A decision framework for choosing the first outreach channel by job title, industry, country, list quality and email availability, with sourced benchmarks.
Asen Levov
· · 8 min read
AI SDR
Most AI SDR failures are setup failures: wrong audience, thin offer, no review, bad data, set and forget. The evidence we found and the controls that help.
Viktorio Shopov
· · 8 min read
LinkedIn outreach
LinkedIn invite 403 feature_not_subscribed while messages work? The cause is usually a Sales Navigator member ID. How to check it and how to fix it.
Asen Levov
· · 6 min read
Outbound strategy and playbooks
The breakup message is the last note in an outreach sequence. How to write it, three versions to adapt, when it works and when not to send one.
Viktorio Shopov
· · 7 min read
AI SDR
Multilingual AI outreach: in a survey of 3,940 installers, 51% replied in a language other than English and the agent matched their language in 92% of replies.
Asen Levov
· · 7 min read
Build vs buy and DIY
Zapier vs Make vs n8n for lead handling: how each counts usage, a worked example for 1,000 leads a month, what no code does well, and when you need an agent.
Viktorio Shopov
· · 7 min read
Written in March 2026 and being rewritten with sourced numbers.
Teams that have used Sellinger