Bounces, complaints & suppression
How bad addresses are handled and where to review them.
When an address hard bounces or complains, we add it to your suppression list. It's enforced on every send (single, batch, and campaign), including CC and BCC recipients.
- Hard bounce — the address is invalid or rejected permanently; it's suppressed (reason: bounced).
- Complaint — the recipient marked the mail as spam; it's suppressed (reason: complained).
- Soft bounce — a temporary failure (full mailbox, greylisting); no suppression, and delivery is retried.
Suppressed recipients are excluded, not failed — surfaced as a "Recipients excluded" event on the timeline. Review the list on the Suppressions tab. You can remove an address there to make it mailable again — but re-sending to bad addresses hurts deliverability.
Suppression is separate from marketing unsubscribe
The suppression list is distinct from a contact's marketing preference. An address can be unsubscribed from marketing but mailable for transactional sends, or suppressed outright. Manage blocks on the Suppressions page; manage preferences on the contact.
Get these as webhooks
Every lifecycle event is available in-app today, and you can also have us POST them to your own endpoint in real time. See the Webhooks guide to register an endpoint and verify the signed payloads.