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. You see a `Argument 7 passed to processPoppedTicket()` error in bounced support emails after performing a WHMCS software update. Troubleshoot and resolve The system prevented an autoresponder from opening a ticket errors. Troubleshoot and resolve Cannot connect to host errors. Troubleshoot and resolve Connection refused errors. Troubleshoot and resolve issues with email importing retrieving the same email replies multiple times. Troubleshoot and resolve The system blocked a potential email loop errors. Troubleshoot and resolve Logon failure: unknown user name or bad password errors. Troubleshoot and resolve cannot select INBOX, is this a valid transport? errors. Troubleshoot and resolve a POP3 cron not running emails and WHMCS Pop Cron Did Not Run errors. Troubleshoot and resolve Error: read failed - connection closed? errors. Customize the text strings that email piping and importing use to detect quoted email replies, preventing cluttered support tickets. Troubleshoot and resolve Sender Verify Failed errors. Set up email importing using POP3 or IMAP with a Google® email account. WHMCS will import the email replies from this account into the correct support tickets. Set up email importing with OAuth2 using Google®. Email importing with Google using this method includes additional security benefits with OAuth2 authentication. Set up email importing using OAuth2 and Microsoft Entra® ID (formerly Azure Active Directory). Email importing with Microsoft includes additional security benefits with OAuth2 authentication. Troubleshoot and resolve Error: the single id was not found in response errors. Troubleshoot and resolve timezone-related automation issues, like incorrect timestamps or cron frequency warnings. Troubleshoot and resolve TypeError guessFileExtension() errors.