Simon,

> > Right. This is a duty of a front-end MTA,
>
> Well the front-end MTA (MX host) is doing this, it's just the recipient
> callout it makes stops at amavis and doesn't get through to the internal
> mail host.  It would have been really convenient to have been able to do
> this :-)

I misunderstood, thinking that amavisd was exposed to the world.

So we have a normal dual-MTA setup, which is fine, as long as the front-end 
MTA keeps the number of parallel SMTP sessions to amavisd at $max_servers
or below. If there are several MX hosts, the limit applies to the
estimated sum of their SMTP sessions.

So your choice is either to use advice from Noel, or make a list
of valid users available to front-end MTAs through some other mechanism
(SQL, LDAP, periodically copying a fresh list from internal to MX).

  Mark

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