Notes Domino Native AS/400 and MS Exchange

We are running v4.6.3 of Notes Domino natively on an AS/400.  We are
also running Notes on an NT server at an offsite location and
replicating mail.  To complicate things, we are using MS Exchange
Connector to keep connectivity to Ms-Mail until transition to Notes Mail

is complete.  For some reason, mail has stopped flowing from Notes to
Exchange (Exchange to Notes is working ok).  I've ended and restarted
Domino Server on AS/400 but still no go.  We've checked Exchange Admin
and did not see anything obvious.  Has anyone experienced a similar
situation or know of some good resources I can use to troubleshoot
further?  Outsourcing company has been somewhat working on this since
Monday when problem occurred with no resolution in site.  TIA



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