Troubleshooting Email Piping Problems
If an email has not been piped into the ticket system, the first reference point is Utilities > Logs > Ticket Mail Import Log.
This shows all the emails processed by the WHMCS email piping process and any errors that may have occurred, explanations of the most common errors are below:
Ticket ID Not Found
This means you are using an email address assigned to an administrator to send your email. Administrators can only reply to tickets, and not open new ones, hence the Ticket ID not found error message.
When testing email piping, you must send an email from an email address that is not assigned to an admin in your WHMCS system.
Blocked Potential Email Loop
This error message indicates that WHMCS received a large number of emails from the same email address, indicating an auto-responder loop
So as to break the cycle WHMCS did not import the email. By default any new tickets from the offending address will be blocked if 10 emails are received from the same address within a 15 minute period, but this can be customised via the Setup > General Settings > Support tab > Ticket Reply EMail Limit setting.
Unregistered Email Address
Seeing this error means you have selected to only allow registered clients to open tickets in this department.
You must untick the Clients Only checkbox in Setup > Support Departments > Edit to allow the public to create tickets.
Only Replies Allowed by Email
This entry in the log means that an email was received to the department email address, but the subject did not contain a ticket ID, therefore represents a new ticket rather than a reply to an existing one.
Due to the Pipe Replies Only option being enabled in the support department configuration, the email was rejected.
This can be disabled in the support department configuration on Setup > Support > Support Departments > Edit