Backups still do make sense, but only if off-net in case your DC is
completely unreachable, I've always run one, privately and commercially,
and none of them really see much spam for a few years now, perhaps
because the spammers of yesteryears think much like you do John :) 

On 02/03/2015 08:47, John Levine wrote: 

> By the way, why do you have a backup MX? These days, it's hard to
> keep the spam filtering on the backup in sync with the primaries, and
> anyone who's not a spammer will wait and retry for long enough that
> you're going to get all of the real mail. Backup MXes made sense in
> the 1980s when networks were flaky and there were a lot of servers on
> intermittent dialup connections. They don't make much sense now.
 
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