Glossary
What is sender reputation?
Sender reputation is the trust mailbox providers such as Gmail and Outlook place in your domain and the servers that send for it. They build it from your history: authentication, bounces, spam complaints, and whether people open, reply or delete without reading. A good reputation gets mail to the inbox; a poor one sends even good mail to spam.
Published by Sellinger AI. Numbers and settings checked on 24 October 2026 against the fact register. Report an error.
What builds and what damages it?
| Builds it | Damages it |
|---|---|
| SPF, DKIM and DMARC that pass | Missing or failing authentication |
| Replies and conversations | Spam complaints |
| Steady, modest volume | Sudden spikes from a quiet mailbox |
| Low bounce rate from a clean list | Many hard bounces |
| People moving mail out of spam | People deleting without opening |
Is it about the domain or the mailbox?
Both. Providers track the domain in your From address and the servers that send for it. When you send through Google Workspace or Microsoft 365, the servers are shared and well known, so your domain's own history carries most of the weight. That is why many cold senders keep outreach on a separate domain; see secondary sending domain.
How do you check it?
Google Postmaster Tools shows reputation and spam rate for mail sent to Gmail users once volume is high enough. Below that, watch your own signals: if replies fall to nothing while sends stay the same, suspect the spam folder before the copy. A reputation damaged by a bad campaign can take weeks of clean sending to recover, and no provider publishes a fixed time.
How Sellinger handles it
Every connected account has daily limits that the agent cannot exceed, set per account. LinkedIn defaults are 20 invitations a day and 150 a week. Email defaults to 50 sends a day per mailbox, with an optional warm up that starts at 5 a day and doubles every 3 days up to the limit. Sending follows a schedule you set (days, hours and time zone). When no schedule is set, a quiet window of 01:00 to 08:00 local time applies.
Sellinger sends from your own connected Gmail or Outlook mailbox. It does not set up or check your domain records, run inbox placement tests or monitor your domain, so you or your IT provider set up SPF, DKIM and DMARC at the domain. When a contact replies with an opt out such as STOP or unsubscribe, in English, Bulgarian or German among other forms, the contact goes on the team's suppression list, the agent stops and the lead is closed out. A weak or unclear phrase never writes the permanent record: the agent stops and a person decides.
Common questions
Can a new domain have a good reputation?
Does warm up fix a damaged reputation?
Does Sellinger monitor my reputation?
Sources and method
General mailbox provider practice; Google Postmaster Tools as described on Google's sender guidelines page, read 19 October 2026 for the linked blog post. Sellinger behaviour from the fact register, checked 24 October 2026.
Related: Email warm up, Spam complaint rate, Bounce rate, Email warmup is not enough.
