Fatal error: Uncaught Error: Class 'Drupal\Core\Mail\Plugin\Mail\PhpMail' not found in /var/www/html/tmp/contrib/mimemail/src/Plugin/Mail/MimeMail.php:24 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/mimemail/src/Plugin/Mail/MimeMail.php on line 24