Blog category · 17 posts
Cold email length, sender rules, deliverability and what still earns replies.
Latest · Email outreach
What an AI cold email writer does well, where it fails and how a chat assistant, a writing tool and an AI SDR differ. With a prompt, a review checklist and the mistakes that cost replies.
Asen Levov
· · 8 min read
Email outreach
How to A/B test cold emails and LinkedIn messages without fooling yourself: one change at a time, random splits, how many sends you need, what to measure and what our own tests and case studies showed.
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 change the answer and how to test your own audience. With Sellinger's send window defaults.
Viktorio Shopov
· · 7 min read
Email outreach
How to end a cold email: one clear call to action, five ask styles compared, sign off wording, what the signature should hold and what the Gong, Instantly and Backlinko sources say. Examples you can adapt.
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 for a volume, how to warm up, what rotation does and the limits Google and Yahoo state. No deliverability promises.
Viktorio Shopov
· · 8 min read
Email outreach
The minimum technical setup before you send cold email: 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
The hard rules every Sellinger email agent follows: facts only from lead data, no invented prices or dates, a stop means stop, plus the system checks on suppression, limits and machine mail.
Viktorio Shopov
· · 7 min read
Email outreach
A step by step guide to B2B 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. With numbers from Instantly, Gong and our own campaigns.
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. Here is what each measured and when cold email works.
Asen Levov
· · 8 min read
Email outreach
How to build a cold email sequence: how many steps, how many days apart, what each step says, when to stop and how a reply ends the sequence. With a day by day table and what the Hotel Pirin letters showed.
Viktorio Shopov
· · 8 min read
Email outreach
What email verification checks, why catch all domains cannot be fully verified, how bounces damage a sender, and a simple routine to verify a list before an AI agent sends to it.
Asen Levov
· · 7 min read
Email outreach
Warmup raises your daily volume gradually, but sender reputation also depends on authentication, list quality, complaints and replies. A nine point checklist, the ramp schedule Sellinger uses, and Google's published thresholds.
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
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
Email outreach
How a partner survey by email reached 3,940 installers in 111 countries and got 225 survey answers: four numbered questions, nothing to click, two follow ups, replies in about a minute.
Viktorio Shopov
· · 8 min read
Email outreach
An AI email agent that answers machine mail wastes sends, inflates reply counts and can start a loop. How machine mail looks, how to detect it, and how Sellinger marks it.
Viktorio Shopov
· · 7 min read
Email outreach
Cold email subject lines that an AI writer should be blocked from using, the legal and trust reasons behind each, what the studies say about length, and 15 plain subject lines it can use.
Asen Levov
· · 6 min read
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