diff --git a/CHANGELOG.md b/CHANGELOG.md
index b39f60d8..490848c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,7 +22,8 @@ All notable changes to this project will be documented in this file. The format
   - Bump version to [1.1.0](https://github.com/fail2ban/fail2ban/releases/tag/1.1.0). For more information, check the [changelog](https://github.com/fail2ban/fail2ban/blob/1.1.0/ChangeLog).
 - **Documentation:**
   - Rewritten and organized the pages for Account Management and Authentication ([#4122](https://github.com/docker-mailserver/docker-mailserver/pull/4122))
-
+- **Postfix**
+  - Disable Microsoft reactions to outgoing mail. ([#4120](https://github.com/docker-mailserver/docker-mailserver/pull/4120))
 
 #### Fixes