Sender Reputation
Sender reputation is a mailbox provider’s assessment of a sending domain or IP. Track provider-specific evidence alongside complaints, authentication, and delivery failures.
Sender reputation is a mailbox provider’s assessment of a sending domain or IP based on its sending history and recipient feedback. That assessment contributes to filtering and acceptance decisions.
There is no universal score
Different providers use different signals and reporting. A third-party score from 0 to 100 is not a shared rating used by every inbox. A good result at one provider does not establish that another sees the same sender favorably.
For Gmail traffic, Google Postmaster Tools can report reputation, spam rates, authentication, and delivery errors when enough data is available. Microsoft SNDS reports on sending IPs and requires authorization to access their data. Reports can be delayed or absent. A blank dashboard is not proof of a good reputation.
Investigate a change
When delivery deteriorates, compare affected recipient domains and response codes with recent changes in signup source, sending volume, content, and authentication. Pause a problematic import, honor opt-outs, and stop sends to known invalid addresses or complaint recipients.
Keep essential account mail separate from promotional audience decisions. Work with your provider on shared-IP issues, while continuing to review the recipients and messages your team controls. Reputation is one input to delivery. It does not determine placement independently of content and other filtering.