[brlug-general] Backup mail hosts?

[Nicholas Istre]

On Tue, September 26, 2006 9:04 pm, Joey Kelly wrote:

> I understand the comment about each mail forwarder needing to match in
> terms
> of RBLs and other anti-spam and -malware measures. As an example, I run
> greylisting, which has proven very effective against unwanted mail. If I
> set
> up a secondary mail server that didn't greylist, I wouldn't be surprised
> if
> mail routed around my temporary block on the primary (which is what
> greylisting is about), thus defeating all my leet anti-spam measures.
> Ditto
> RBLs, etc..

This is actually a used spamming technique.  Connect to the lowest
priority MX server, because it is likely that box was setup with no
anti-spam measures in mind.  A counter to this is to setup a box at the
lowest priority that accepts an SMTP connect, but refuses all mail.