Re: backup MX need (was Re: Hardware...)

["Bjorn Nilsen" <bjorn@valhalla.net.nz>]

I have used the secondary MX as an antispam tool. I configured my
secondary MX to use an extensive list of RBLs and return a tempory
error if the sender was listed. I found that this cut large percentage
of spam as either the sender would not even retry or my primary MX
which has conservative RBLs and spamassassin would be able to give
these messages a higher score.

>
> that's not a bad thing to do - it wastes the time of spamware and viruses when
> they try to connect...especially if you have packet filtering rules which just
> DROP the connection rather than simply not listening on port 25.
>