I'm using this tutorial to set up a mail server: http://www.howtoforge.com/virtual-u...urier-mysql-and-squirrelmail-ubuntu-14.04-lts I've followed the directions exactly, substituting my own FQDN instead of 'server1.example.com', and replacing passwords as necessary. I used the phpadmin browser interface to add users to the database, as instructed. When I try to login using the Squirrelmail web interface from a connected machine (which can successfully ping my mail server), I get one of two errors: 1) ERROR: Connection dropped by IMAP server. or 2) Unknown user or password incorrect. I have checked carefully to make sure that I'm typing my passwords correctly, and have deleted and re-added a couple of users just in case. There also does not seem to be a pattern as to which of the two errors I get on any given attempt. Any ideas as to what might be going wrong?