> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailofly.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Managing the Suppression List

> How Mailofly handles hard bounces, spam complaints, and manual suppressions to protect your sender score.

# Managing the Suppression List

A **Suppression List** is an automated safety mechanism that prevents your application from sending emails to addresses that have previously hard-bounced, marked your mail as spam, or unsubscribed.

Repeatedly attempting to send to non-existent or complaining addresses damages your IP and domain reputation, quickly causing inbox providers to route your messages to spam.

***

## What Triggers Automatic Suppression?

* **Hard Bounces (`550 User Unknown`)**: If a recipient mailbox does not exist or the domain is dead, the address is permanently suppressed.
* **Spam Complaints**: When a recipient clicks "Report Spam" in a supported webmail client (via Feedback Loop), the address is instantly suppressed.
* **Unsubscribes**: When a user opts out via your unsubscribe link or List-Unsubscribe header.

***

## What Happens When You Send to a Suppressed Address?

Mailofly immediately drops the message before dispatch.

* **Log Status**: The email status is marked as `failed` or `suppressed`.
* **Reason Captured**: `Recipient address is suppressed due to previous hard bounce or complaint.`
* **Billing**: Suppressed drops do not count against your billable sending quota.

***

## Removing an Address from Suppression

If a recipient made a mistake or resolved their mailbox issue:

1. Go to **[Suppressions](https://www.mailofly.com/user/suppressions)** in your dashboard.
2. Search for the email address.
3. Review the bounce reason and timestamp.
4. Click **Remove from Suppression** to re-enable sending.


## Related topics

- [List Suppressions](/api/suppressions/list-suppressions.md)
- [Managing Emails](/receiving/managing-emails.md)
- [Remove Suppression](/api/suppressions/remove-suppression.md)
- [Add Suppression](/api/suppressions/add-suppression.md)
- [Retrieve Suppression](/api/suppressions/retrieve-suppression.md)