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Fresh Ubuntu 14.04 installed, Qmail + Dovecot configured and activated, actively whitelisted my IP. Sadly it's all the same as before. I don't know if it even matters but I'm still going to post the logs. Thunderbird tries to automatically guess the correct settings: Mar 5 16:41:32...

Well then that's the plan for now. Thanks for all your help so far! I'll certainly report back either if email works after the clean install or if it doesn't. ;)

Okay. a) So I blocked the IP (was only one all the time) in the Firewall. According to a WhoIs it belongs to a VPS provider. I guess I should contact them to tell them of the unusual actions? b) I adjusted Fail2Ban and c) disabled debug mode. d) I made the suggested changes. Didn't revert them...

The situation kind of scares me a little bit which is why I just disabled the dovecot service for the moment.

@trialotto It's always been Thunderbird, from the first screenshot until now. :) I don't use umlauts in any of the relevant settings or names. Also the Thunderbird installation at work was actually in English to exclude all eventualities. I'm not sure about normal/encrypted passwords since (as...

auth.log doesn't state anything except the SSH login when I downloaded the auth.log via SCP I don't have Fail2Ban running on the server at the moment. whitelisting the server's IP on my local machine didn't help Thunderbird settings seem to be fine. I don't think TB's settings are the problem...

Of course. Here you go: # 2.2.18: /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.8 (0c4ae064f307+) # OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.3 ext4 auth_debug = yes auth_debug_passwords = yes auth_mechanisms = plain login digest-md5 cram-md5 apop auth_username_chars =...

Oh sorry, I didn't realize I actually just should switch to kind of reset Postfix. I did now, though it didn't do me any favor. :( Mar 3 22:28:00 #server_name# dovecot: imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges Mar 3 22:28:00 #server_name#...

First: Thanks for all the answers and help attempts so far! :) Second: Sadly switching to Qmail didn't fix the problem. The mail log pretty much states the same: Mar 3 21:44:37 #server_name# dovecot: imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key...

Unfortunately that didn't help. IMAP port 993: After testing the connection Thunderbird states a "Thunderbird failed to find the settings for your email account." IMAP port 143: After testing the connection Thunderbird overrides "Normal password" with "Encrypted password" in IMAP and "Encrypted...

The used credentials should be correct since they're the same ones that I use to successfully log into the webmailer.

Hi everyone, I got a server up and running the other day with Plesk preinstalled. So I got myself a license since I really like the control panel thus far. Everything works with one exception: emails with Dovecot. Sending and receiving emails does work with the Roundcube webmailer Receiving...