I receive once in a while mail pretending to come from my own domain. Are there people who figured out a filter rule or a condition to put into smtpd.conf to block those kind of mail ?
Keep in mind that mailinglists muddy the water here a bit. Especially if you run a domain for multiple users, it is quite possible that a mailinglist will end up legitimately sending a mail from one of your users to another.
Kind regards, Maarten de Vries
