Exchange 2010 Mail Enabled Distribution Group Won't Receive from External Address

Let me pre-empt the usual first response: yes, I've unchecked "require that all senders are authenticated" on the Message delivery Restrictions properties of Message Delivery Restrictions. I cannot get a message from an external mail server to
send to an internal mail-enable distribution group. It's working internally. I've checked our ironport and the message is being sent to exchange (at least I think it is).
How can I troubleshoot this?!
tfgeorge

Ironport is definitely sending this email to exchange. Please read:
06 Jun 2011 08:53:20 (GMT -05:00)
Protocol SMTP interface Main Interface (IP Gateway IP) on incoming connection (ICID 17720578) from sender IP 65.54.190.154. Reverse DNS host bay0-omc3-s16.bay0.hotmail.com verified yes.
06 Jun 2011 08:53:20 (GMT -05:00)
(ICID 17720578) ACCEPT sender group UNKNOWNLIST match sbrs[-1.0:6.0] SBRS 3.0
06 Jun 2011 08:53:20 (GMT -05:00)
Start message 2136865 on incoming connection (ICID 17720578).
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 enqueued on incoming connection (ICID 17720578) from
[email protected].
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 on incoming connection (ICID 17720578) added recipient ([email protected]).
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 contains message ID header '<[email protected]>'.
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 original subject on injection: TEST
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 (1471 bytes) from
[email protected] ready.
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 matched per-recipient policy DEFAULT for inbound mail policies.
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 scanned by Anti-Spam engine: CASE. Interim verdict: Negative
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 scanned by Anti-Spam engine CASE. Interim verdict: definitely negative.
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 scanned by Anti-Spam engine: CASE. Final verdict: Negative
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 scanned by Anti-Virus engine Sophos. Interim verdict: CLEAN
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 scanned by Anti-Virus engine. Final verdict: Negative
06 Jun 2011 08:53:20 (GMT -05:00)
Message 2136865 queued for delivery.
06 Jun 2011 08:53:20 (GMT -05:00)
SMTP delivery connection (DCID 1658840) opened from IronPort interface 100.100.100.100 to IP address 100.100.100.100 on port 25.
06 Jun 2011 08:53:20 (GMT -05:00)
(DCID 1658840) Delivery started for message 2136865 to
[email protected].
06 Jun 2011 08:53:21 (GMT -05:00)
(DCID 1658840) Delivery details: Message 2136865 sent to
[email protected]
06 Jun 2011 08:53:21 (GMT -05:00)
Message 2136865 to
[email protected] received remote SMTP response '2.6.0 <[email protected]> [InternalId=919833] Queued mail for delivery'.
tfgeorge

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