> ## Documentation Index
> Fetch the complete documentation index at: https://openmail-docs-cc-replies.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Suppressions

> OpenMail automatically suppresses sending to addresses that have bounced or unsubscribed. Learn how suppressions work and how to manage the list.

When an email bounces, a recipient marks your email as spam, or someone unsubscribes, we automatically add them to your suppression list. Subsequent send attempts to that address are rejected.

## Suppression types

| Type        | Trigger                           | What it means                         |
| ----------- | --------------------------------- | ------------------------------------- |
| `bounce`    | Hard bounce from recipient server | Address is invalid or doesn't exist   |
| `complaint` | Recipient clicked "Report spam"   | Recipient doesn't want email from you |
| `unsub`     | Recipient unsubscribed            | Recipient opted out                   |

## What happens when you send to a suppressed address

The send request returns `422` with a typed error:

```json theme={null}
{
  "error": "recipient_suppressed",
  "type": "complaint"
}
```

Your agent should handle this gracefully - for example, by noting that the contact is unreachable and trying an alternative communication channel.

Suppressions are one part of maintaining good deliverability. For the full picture — warm-up strategy, inbox distribution, and content best practices — see [Email deliverability](/best-practices/email-deliverability).