Morning Ronan, > I added a dummy mx record (lowest preference) as we all know its > generally the one th spammers target first, which is getting hit with > about 50% of our daily connections, of which i defer all of them at a > very low overhead. >
May I ask what kind of software/settings do you use to defer the connections? I've been wanting to do this myself, but haven't figured out an easy way to do this without writing code. I've done this in the past by binding a second mx to a second IP on the primary mail server and blacklisting IPs which tried to contact the second IP (since I was 100% positive the first was reachable). Turns out there's some stupid SMTP servers out there that try lower pref MX servers when the first return a 5xx error. Dale
