From: Bryan Irvine (sparctacusgmail.com)
Date: Wed Mar 01 2006 - 19:59:14 CST

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> Backup MX is a relic and a legacy. It breaks almost all spam filters.
> Modern mail infrastructure doesn't need it, except in rare cases.

why so? I use one here at work with great success. I use Postfix so
I'm no use to the OP. I don't have any problems with double bounces,
and my spam tools aren't broken.

I have noticed that spammers won't even bother trying to connect to
the primary, they just try the backup thinking that my primary server
will accept mail as a relay from the backup, which of course it will,
but only if that message passes spamd, 3 rbls, and amavis/SA, in which
case it would have passed on the primary one anyway if I didn't have a
backup configured at all.

Seems to be just fine.

--Bryan

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