I'm seting mailserver by reference http://www.howtoforge.com/virtual-us...debian-squeeze
step by step. until step test SquirrelMail login with user with i'm create in step14.
i'm found return error message in squirrelmail login
ERROR: Connection dropped by IMAP server.
and when check log of /var/log/mail.err
what directory It's mean? and how to fix this problem.