Hi,

Could somebody please advise what the best (easiest, fastest) way is to
accomplish the following postfix behaviour on a mail gateway (a.k.a
firewall) between an intranet and the Internet:

* Only restricted hosts on the intranet should be able to dump mail on
the gateway that should be delivered to the Internet (we use an SMTP
backbone and we want only the backbone SMTP servers to be able to connect to
the gateway for sending mail to the internet. Individual users should dump
their email on the SMTP backbone, not directly on the firewall).
* On the other hand, on the outside interface of the gateway, I want
to accept email from the whole Internet for my local (virtual) domains. In
this case, anti-relaying should be in effect to prevent us from being used
as a relay.

Thanks,

                 Frank

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