Glossary
Glossary1 min read
Sender Reputation
Sender reputation is the trust score receivers assign your domain and IP. A definition, with the full guide linked.
RT
RepMail Team
Product & Engineering · July 17, 2026 · 1 min read
Sender reputation is the running trust score receiving mail servers keep on your sending domain and IP. It is built from authentication, sending consistency, list quality, and recipient engagement.
It is earned slowly and lost quickly: one bad send to a stale list can undo weeks of warm-up.
See the full guide: Full guide: building sender reputation.
Resources in this guide
What builds it
Reference| Input | Signal |
|---|---|
| Authentication | SPF/DKIM/DMARC pass |
| List quality | Low bounces and trap hits |
| Engagement | Opens, replies, few complaints |
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Frequently asked questions
Is sender reputation tied to domain or IP?
Both, tracked separately. Domain reputation follows your sending domain; IP reputation is tied to the address your mail leaves from.
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