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Is phpmailer_smtp compatible with Drupal 11?

Yes. phpmailer_smtp supports Drupal 11 from version 2.2.6.

Projectdrupal.org/project/phpmailer_smtp (module)
What it doesUses the PHPMailer library to send emails via SMTP.
Latest stable release3.0.0 (core: ^11.2 || ^12)
First release supporting Drupal 112.2.6
Best upgrade step (runs on 10 and 11)2.4.1
Drupal 12Supported from 3.0.0
Maintenance statusnot stated
Security advisory coveragecovered

Upgrading from Drupal 10

While you're still on Drupal 10, update phpmailer_smtp to 2.4.1 with composer require drupal/phpmailer_smtp:^2.4. 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.