Dale Blount wrote:
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
umm yeah... exchange for one! ;)
well we run exim almost exactly as you described how you implemented it.
We run the 4th mailhub/mx on the primary with a second ip, but just
defer all the traffic using either a line in the main exim config
(
if match-interface defer..
) but we noticed that this was eating all our connections up so we
simply started a new daemon and assigned it the dummy IP which merrily
accepts all connections but simply defers them(NOT REJECTS)
--
========
Regards
Ronan McGlue
Info. Services
QUB
