Pegasus Mail & Mercury

oaneadp: I’ve been doing some testing, when “Authenticated SMTP connections may relay mail” is checked, the setting of “Do not permit SMTP relaying of non-local mail” seems to become irrelevant; because regardless of its state - as long as I authenticate whilst sending a mail, I can send make the “FROM:” header anything, for example ...

There is absolutely no necessity to get complicated. The more complicated the solution, the more difficult it is to implement. And few of the ''anti-spam technologies'' tackle the problem where it occurs, which is actually where it must be tackled. Once it gets past the SMTP layer, i.e. at the mail clients, all the ''anti-spam technologies'' are ...