I'm sure this is an easy one.
One of our domains, call it mydomain.com, receives a lot of spam sent from a falsified address, eg [email protected], and Spam Assassin seems to classify all such mail as "non-spam" regardless -- the spam score is a big negative number.
What I want to know is if there is a simple way to tell Exim: "If mail for mydomain.com has a sender address [email protected] but the orginating server is not *this* server, throw it away".
I'd rather not go down the route of using SPF for this.
One of our domains, call it mydomain.com, receives a lot of spam sent from a falsified address, eg [email protected], and Spam Assassin seems to classify all such mail as "non-spam" regardless -- the spam score is a big negative number.
What I want to know is if there is a simple way to tell Exim: "If mail for mydomain.com has a sender address [email protected] but the orginating server is not *this* server, throw it away".
I'd rather not go down the route of using SPF for this.