---
title: "Suppressions"
description: "Addresses blocked from receiving mail — protecting your sending reputation."
url: https://www.unitpost.com/guides/suppressions
section: Guides
updated: 2026-07-31
---
# Suppressions

## Suppressions

> Addresses blocked from receiving mail — protecting your sending reputation.

A suppression is an address-level block that excludes a single email address from every send — transactional, batch, and campaign — including CC and BCC. The match is case-insensitive. Suppressions keep you from mailing addresses that have already bounced or complained.

### Automatic suppression

When a message hard-bounces or the recipient complains, the 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.

### Adding your own

Add addresses by hand from the Suppressions tab on the Contacts page — paste one or many and they're suppressed in a single step. The same operations are available via API at /api/v1/suppressions.

> **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. Removing an address that previously bounced or complained shows a warning, as re-sending to it can damage deliverability.

## Related

- [Segments](https://www.unitpost.com/guides/segments): Named groups of contacts that campaigns send to.
- [Subscription topics](https://www.unitpost.com/guides/topics): Let contacts opt out of one kind of mail without leaving your list.
- [Campaigns](https://www.unitpost.com/guides/campaigns): Send a template to a segment — now or on a schedule — with server-enforced safety gates.