Suppression list
The suppression list is your account-wide do-not-send list. It protects your sender reputation by making sure addresses that bounced or complained never get mailed again.
How addresses get suppressed
| Field | Type | Description |
|---|---|---|
| bounce | automatic | A permanent (hard) bounce adds the address immediately. |
| complaint | automatic | A spam complaint adds the address immediately. |
| manual | you | Added in the dashboard or via the API — for unsubscribe imports, legal requests, or known-bad addresses. |
What suppression does
Suppressed recipients are removed from every send — transactional and broadcast — before handoff. If all recipients of an email are suppressed, the email is recorded with status suppressed and a suppressed event listing the skipped addresses; if only some are, the rest still receive it.
Managing the list
Dashboard → Suppressions lets you search, add, and remove addresses. The same operations are available with an API key:
GET /suppressions?q=ada&limit=50&offset=0
POST /suppressions {"email": "ada@example.com", "reason": "manual"}
DELETE /suppressions/:idRemoving a bounce/complaint suppression makes the address mailable again — only do it when you're confident the underlying problem is fixed (e.g. a mailbox that was temporarily full and hard-bounced). Re-mailing complainers hurts deliverability for everyone you send to.