Problems in the support ticket system and its related features can prevent email replies from importing properly and cause other disruptions.
Email importing retrieves customers' email replies to support tickets. You can use POP3, IMAP, Google®, or Microsoft® for email importing.
Troubleshoot and resolve Argument 7 passed to processPoppedTicket() errors.
Troubleshoot and resolve The system prevented an autoresponder from opening a ticket. (WHMCS 8.4 and later) or Prevented an Auto Responder from Opening a Ticket (WHMCS 8.3 and earlier) errors.
Troubleshoot and resolve Cannot connect to host errors.
Troubleshoot and resolve Connection refused errors.
Troubleshoot and resolve Department Not Found errors.