Kenneth Porter via Postfix-users:
> The biggest headache I had when I used a backup MX was avoiding
> backscatter. So I tweaked my milter on the primary to always accept mail
> from the backup and never reject/bounce it. If necessary, silently drop
> spam.
>
> Alas, secondaries tend to be targets for spammers, on the assumption
> they get less attention by admins and have weaker spam rules. If you run
> SpamAssassin, you could add a small extra score for mail coming through
> the secondary when the primary is known to be up.
That may raise false rejects when the primary and secondary MX are
on different networks, and for some reason the path client -> primary
has a temporary outage that does not affect the path client ->
backup -> primary.
Wietse
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