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https://www.mcseboard.de/topic/203207-wie-meldet-man-sich-per-imap-an-exchange-2010-an/
https://serverfault.com/questions/517329/dovecot-not-letting-me-telnet-localhost-110-imap-and-pop3-login-not-starting
https://wiki.dovecot.org/TestInstallation
https://forum.iredmail.org/topic13145-users-cant-login-into-roundcube-could-not-connect-to-127001143.html
https://forums.freebsd.org/threads/roundcube-could-not-connect-to-localhost-143-unknown-reason.61423/
https://lists.centos.org/pipermail/centos/2014-March/141693.html
https://forum.netcup.de/anwendung/imap-pop3/6028-roundcube-verbindet-nicht-mit-imap-dovecot/
https://www.sitepoint.com/community/t/error-connecting-to-imap-server-localhost/4578
https://www.heise.de/security/artikel/E-Mail-Verschluesselung-austesten-785451.html
https://www.tldp.org/HOWTO/Postfix-Cyrus-Web-cyradm-HOWTO/test.html
https://www.emailquestions.com/threads/mail-server-not-listening-on-port-993-and-995.8874/
http://interserver.net/forum/threads/email-configuration-with-postfix-dovecot-roundcube.4506/
https://support.plesk.com/hc/en-us/articles/213921285-Unable-to-access-webmail-when-localhost-is-using-IPv6-Error-connecting-to-mail-server