I did the following; emacs /etc/mail/access and added; such&such.net ERROR:"550 MESSAGES FROM YOUR DOMAIN BLOCKED DUE TO SPAM" then ran; root]# /sbin/service sendmail restart Shutting down sendmail: [ OK ] Shutting down sm-client: [ OK ] Starting sendmail: [ OK ] Starting sm-client: [ OK ] Will this achieve the goal? Dirk