Suppressions
Addresses blocked from receiving mail — protecting your sending reputation.
A suppression is an address-level block: a single email address that is excluded from every send — transactional emails, batches, and campaigns alike — including when it appears in cc or bcc. The match is case-insensitive, so JANE@Example.com and jane@example.com are the same entry. Suppressions are the safety net that keeps you from repeatedly mailing addresses that have already told you (or your provider) to stop.
Automatic suppression
When a message hard-bounces or the recipient files a spam complaint, that address is added to your suppression list automatically and silently skipped on future sends. This is the single most important thing you can do for deliverability: continuing to mail an address that bounced or complained is exactly what gets a sender's reputation — and yours along with it — throttled or blocked.
Adding your own
Add addresses by hand from the Suppressions tab on the Contacts page — paste one or many (comma, space, or newline separated) and they're suppressed in a single step, with an optional note for your own records. Anything you add is scoped to your workspace and shows a Manual or Imported reason. The same operations are available over the API at /v1/suppressions for programmatic hygiene (e.g. syncing an unsubscribe list from another system).
Excluded, not failed
A send to a suppressed address isn't an error — the send succeeds, the suppressed recipients are simply dropped, and the result tells you how many were excluded and why. One bad address never fails the whole send.
Platform-wide blocks
Some blocks are read-only
Addresses on the Unitpost-wide list (reputation/abuse protection) appear with a “Platform” badge and can't be removed from your workspace. They're shown so you understand why a send was skipped — if you believe one is in error, contact support.
Removing an address
Any member with the manage-suppressions permission can remove an address you added — individually or in bulk — and it becomes mailable again immediately. Removing an address that previously bounced or complained shows an explicit warning first, because re-sending to it can damage your deliverability. Removals (and additions) are recorded in Activity so there's always a trail.