Hi, I use debian GNU/linux sarge 3.1 stable. I have followed step by step the tutorial: (without the quota stuff) http://www.howtoforge.com/virtual_postfix_mysql_quota_courier At the end of the tutorial I have tried to do this: telnet localhost 25 ehlo localhost mail from:<firstname.lastname@example.org> rcpt to:<email@example.com> data . quit And it works, I get no errors and I can see the e-mail in the right folder /home/vmail/example.com/sales/new But I have problems: I have tried to use thunderbird from a pc in the same lan, and I can't send/receive e-mails: it asks me password, but it never authenticates me. I get this in mail logs: imaplogin: LOGIN FAILED, ip=[::ffff:192.168.0.21] (192.168.0.1 is the ip address of the pc I use to connect to the mail server (192.168.0.11) postconf -d | grep mail_version = 2.1.5 What's wrong? Thanks in advance.