Hi, This might be a stupid question, but I recently received a email spam from one of my users [email protected], which was spam. After asking her about it and afterwards checking logs, it turns out it came from some random Brazilian server (and she was not hacked *sigh of relief*). But the spam email from seemingly our own user got me to wondering how to prevent such situations happening in the future.
I am aware of SPF, but is there a Postfix-way of stopping spammer sending emails with my own spoofed domain? Making Postfix aware not to accept emails from (supposedly) [email protected] when not originating from a host listed in mynetworks ? Jonathan
