Hi When i was looking trough my logs tody i found that my host had been used as a relay host... I changed from sendmail to postfix because everyone told me that postfix was more secure.
When looking at the default configurationfiles installed by debian there was nothing that prevents unauthorized users to send mail to anyone. By adding this line to main.cf you can make sure that only your host can send mail to users outside your system: smtpd_sender_restrictions = check_relay_domains, reject_unknown_sender_domain Is this someting that should be added by default?? I think so.... /I
