[CONFIGURATION] RasPi Mail Server - Dovecot & Postfix Configuration

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http://www.kubuntuforums.net – Once again I'm in need of help. I have a mail server running on a Raspberry Pi (Raspbian). I can use Squirrelmail (webmail) to check, send and receive emails - everything is A-OK on that end. My problem is with setting up IMAP synchronisation in Thunderbird. When I add the account to Thunderbird, it finds these settings (these are what I expected): imap-troubleshooting.jpg These settings work for incoming mail, but don't let me send messages. When I try, I get the following error: imap-troubleshooting-2.jpg I also get errors using K9 mail on Android. To be clear, I want t (HowTos)