I have successfully completed the Howto by Falko on mail server on Ubuntu 8.04 with virtual domains. I can administer with phpmyadmin. I can log into squirrelmail and can send to external email addresses. I can send from external email and it is received in squirrelmail. I have tried to setup outlook to connect to it (on same LAN) and I can download the emails to outlook OK but I cant send. I get a "network password" popup which doesnt accept my username (email account) and password. I know these are correct because I can log into squirrelmail with them and outlook can use them to get mail via POP3. my mail log says this I noticed in /var/log/auth.log my /etc/pam.d/smtp (usernames and passwords are correct but edited in post) /etc/postfix/sasl/smtpd.conf EVERYTHING else is working though. In outlook I have enabled "SMTP requires authentication" but no joy. in the setup I have ticked "outgoing server use same credntials as incoming" I am so close now it hurts. Any help would be greatly appreciated. Thanx in Advance.