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From: Graham Dunn <gdunn01@harris.com>
Date: Thu, 05 Apr 2007 14:20:43 -0400
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Subject: Re: slightly OT - my freebsd email topology
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Jonathan Horne wrote:
[snip]
> i would like to change it up, so that i have a pair of servers doing MX from the
> internet, which then passes to an internal server for delivery.  if i do that, i
> could remove spamassassin from the internal server, and run it on just the 2
> external.  all those configurations is really not my issue here... what im
> really pondering is how would external servers that are seperate from where the
> target mailboxes are, know which addressess are acceptable and which to return a
> 550?
> 
> does anyone have any setups that are similar to this, and could advise me or
> point me in the right direction?

The simplest way I've found is to assemble your own access file (either
from /etc/passwd or LDAP) and distribute that to your MX hosts.

Graham