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Yes, that's correct because you can't know how many messages are on a single connection, or how many recipients that message had since you never received the message... We've done exentive tests with ISP's to get the averages and as far as I've seen ...
For the moment, you'd be forced to use different listeners. So 1 public listener where the mail comes in for the domains that you have on LDAP and thus enable LDAP accept for. The other listener for the other domains. I believe we're looking at this ...
You should use this:(|(mail={a})(proxyAddresses=smtp:{a}))Note the "smtp" before the colon. I run SBS 2003 with Exchange2003, this query works just find.Cheers,Luk