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Dovecot IMAP server

Dovecot is a secure IMAP server that can also do authentication. Dovecot can be used in conjunction with Exim to create an SMTP-AUTH mechanism for authenticating SMTP requests.

Troubleshooting

If you're using Exim and trying to connect to Dovecot's auth-client and you receive this message; "435 Unable to authenticate at present: authentication socket connection error" You ought to check the ownership of the Dovecot authentication client socket. It runs in /var/run/dovecot/auth-client and you can see its ownership there. If you have set it to "mail" or similar you'll likely need to change it to Debian-exim so Exim can read and write to the socket.

See also

* http://wiki2.dovecot.org/HowTo/EximAndDovecotSASL