I'm getting this message in /var/log/mail.log when trying to send email with mutt: "User unknown in virtual alias table" (The mail bounces). We've got Mutt 1.5.13 and Debian Linux 2.6.18-6-686 (i686). I have no problem sending mail with icedove (thunderbird). I'm new to postfix (and mutt) and don't understand how to configure the difference between our computer's domain and the domain of the dsl server. Help appreciated.