In the past month, I've been receiving a lot of junk/spam emails from CiviCRM. The email is titled "Mail delivery failed: returning message to sender" with the message:
This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: [email protected] message has lines too long for transport
I'm using Drupal 7.82/CiviCRM 4.43.2. CiviMail is not enabled and my outbound mail is selected as mail(). No issues there. Users use the mail system to send copies of case activities through CiviCase.
This error seems to be related to ONEspecific case activity that's stuck in queue. Is there a way I can stop this email from resending?