> ## Documentation Index
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# 550 [FBL] Block

> Account blocked due to spam complaints via Feedback Loop

### Introduction

This error occurs when your account has been blocked due to spam complaints received through Feedback Loops (FBL). FBL is a mechanism where mailbox providers inform JetEmail when recipients mark your emails as spam.

### What is a Feedback Loop Block?

A Feedback Loop block is a permanent security measure implemented when we receive spam complaints about emails from your domain. Here's what you need to know:

1. **Feedback Loops**: Email providers send us automated notifications when recipients mark messages as spam
2. **Permanent Block**: FBL blocks are permanent and cannot be automatically unblocked
3. **Domain-wide**: The block affects all sending from the reported domain

### How to Address This Error

Due to the serious nature of FBL blocks:

1. You must contact JetEmail Support to discuss the situation
2. Be prepared to provide:
   * Details about your sending practices
   * Steps you'll take to prevent future spam complaints
   * Information about your email list collection methods

**Note**: FBL blocks cannot be self-service unblocked through the dashboard. These blocks require manual review by our compliance team.