IMF behind smarthost

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#1 IMF, Connection Filtering
Does Exch2003 IMF and Connection Filtering work properly behind a smarthost?
Message flows as follows: the internet --> smarthost --> exchange2003 (and
the other way around for outgoing mail). I manage both smarthost and
Exchange box at this office. I enabled SMTP virtual server logging. I don't
see the actual IP address of the sending mail server. I see my smarthost IP
address instead. That's why I doubt that IMF, Connection Filtering will
work. How do I use those features in this type of environment where Exchange
SMTP does not "talk" directly with machines on the internet?

#2 Recipient Filtering
At the moment the firewall is configured to allow incoming messages sent to
a list of users (manually entered on the firewall). The rest is rejected by
the firewall. There are no NDRs generated by Exchange or the smarthost. I'd
like to use recipient filtering feature so I won't have to worry about
entering a new email address whenever there's a new mailbox. If I enable
Recipient filtering, will exchange send an NDR if an incoming mail is sent
to non-existent address? I'm afraid that it'll flood my server with
thousands of NDRs.


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