> All mail that the backup recieves should be sent on to the primary
> when it is back up. Then at the primary any relay checking will be
> done.
Actually, that isn't the case. SMTP AUTH can't be done at the primary if it receives
it from the secondary (rather, the secondary can't usually do SMTP AUTH, unless it
knows all accounts/passwords). IMail on the primary has to either accept or reject
all mail from the secondary; it can't go past that to check the IP address that
connected to the secondary (Declude does do this however).
So, relay checking should be done at both the primary and the backup.
--
-Scott
Declude: Anti-virus and Anti-spam solutions for IMail. http://www.declude.com
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