I am having a major issue with Thunderbird not saving Outgoing emails in Send Folder with IMAP setting. Having three mailboxes two are set to IMAP and the third set to POP3. The IMAP outgoing mail creates an alert that mail was sent but copy not placed in your Sent folder due to network of file access errors. Outgoing mail in POP3 save immediately to the Sent folder. I am using the latest Thunderbird update: * Server Type: IMAP Mail Server * Server Name: IMAP.kinect.co.nz * Connect Security: SSL/TLS * Authentication Method: Normal Password Outgoing Server [SMTP] Settings: * Description - User name * Server Name: smtp.kinect.co.nz * Port: 465 * Connection security: SSL/TLS * Authentication method: No authentication Note: Authentication was changed form Normal Password in order to gain some traction on the issue during trouble, cause and correction actions. Addendum: The PC was fitted to Starlink [https://en.wikipedia.org/wiki/Starlink] in preparation for use as sole source for internet connection. That was abandoned due to email issues.