Check your configuration document. Do you have any entries in "Deny messages from the following internet addresses/domains:" or "Allow messages only from the following external internet addresses/domains:"
If so, what are they? Exactly.
This log clearly shows your Domino MTA rejecting mail from <> because "Sender is denied in your configuration". This probably means an entry in "Deny messages from the following internet addresses/domains:" is causing the rejection.
For the life of me, I can't figure out how you have managed to get a null entry in there, but if you post the contents of that field, we'll see.
If by any remote chance a deliberate ploy by you to reject null sender envelopes please note that you CANNOT refuse MAIL FROM:<> in this way.
All well formed delivery status notifications (the most common form of which are bounce messages) use a null reverse path. They have to. That is what the RFCs require, for a very good reason (to prevent a deadly embrace, where two mail servers bomb each other into oblivion, each trying to tell the other that the user they are trying to reach isn't there).
HTH
Chris Linfoot
http://chris-linfoot.net
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. . . . . . . . . . Oh boy (~Karl Eknuplopo... 12.Sep.03) 
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