Module atlas › mailsystem
Is mailsystem compatible with Drupal 11?
Yes. mailsystem supports Drupal 11 from version 4.5.0.
| Project | drupal.org/project/mailsystem (module) |
| What it does | Mail System |
| Latest stable release | 4.5.0 (core: ^9 || ^10.1 || ^11) |
| First release supporting Drupal 11 | 4.5.0 |
| Best upgrade step (runs on 10 and 11) | 4.5.0 |
| Drupal 12 | Not declared yet |
| Maintenance status | Actively maintained |
| Security advisory coverage | covered |
Upgrading from Drupal 10
While you're still on Drupal 10, update mailsystem to 4.5.0 with composer require drupal/mailsystem:^4.5. Then run drush updb. That release works on both 10 and 11, so it won't block the core upgrade.
Drupal 10 security support ends on December 9, 2026. To see every module on your site at once, scan your composer.lock. The scan is free, runs in your browser, and gives you a fixed price for the whole upgrade.