Problems with your system email can prevent you from sending email to clients or connecting to your mail provider.
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.
The Mail tab allows you to configure how WHMCS sends and manages email.
You can choose from several supported mail providers for your WHMCS installation.
Troubleshoot and resolve Bad Request errors when importing email replies from Microsoft®.
Troubleshoot and resolve Connection unsuccessful errors when importing email replies from Microsoft.