message to outside world stuck in queue

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From: Sandy Ryan (SandyRyan_at_discussions.microsoft.com)
Date: 10/14/04 

Date: Thu, 14 Oct 2004 15:05:08 -0700

Configuration:
ISA as firewall
Exchange 2003 -

Internal messages are sent fine - external messages are queued with "The
communication was dropped by the remote host."
This is a new exchange server (the original died - but could send messages
out the ISA)....

any clues for me to check?
thanks

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