Running debian 6, I believe I've enabled everything correctly, followed various guides to double check as I've been working on this for 3 days now. I've tested both dovecot and postfix with telnet and they work as best as I can tell, however I'm not getting the expected SASL support response when using smtp. I don't really know how to troubleshoot it further than that.
I run a Ubuntu 10.04 VPS with Postfix and Dovecot installed. For a while I had problems with the mailserver itself (Postfix) but now it runs ok. I can telnet into it from localhost (telnet localhost 25 while logged in) and Im blocked if I try to do it from the outside (telnet mail.example.org 25).
We have just migrated our email to a new server but the new system is not recognising client log in attempts, in the mail log the message 'Disconnected (no auth attempts in 0 secs): user=<>' is displayed.
This problem is almost undoubtedly because one or more configuration files have not been copied over or configured properly or perhaps because an authentication system has not been installed.