If you encounter the following error after updating from the Swiftmailer module to the Symfony module:
Connection to “process/usr/sbin/sendmail -bs” has been closed unexpectedly.
This issue has also been reported on the drupal.org community website: https://www.drupal.org/project/symfony_mailer/issues/3343418RESOLUTIONFollow the instructions in this article: Sendmail Settings for Drupal Symfony Mailer and Drupal Symfony Mailer Lite.
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