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What does "452 Can't Parse Sender Address" mean?

Hi,

	When I did a mailq -sv, I got the following error message

smtp/[130.63.231.101]:
	 2100:   452 Can't Parse Sender Address
          id    <dig-Aviation-6.8@mc.lcs.mit.edu>
          from  <@mc.lcs.mit.edu:aviation-request>
          to    syeon@ASIMOV.CALUMET.YORKU.CA

and zmailer won't deliver the message. Any idea what "452 Can't Parse Sender
Address" means?

Thanks

/pok