trouble dispatching incoming email to correct queue

Hi,
Here's my problem. My office uses MS Exchange as its primary e-mail
provider. We have a previously created distribution list called DL
WEBSUPPORT, that used to send mail to a group of individuals, but now sends
mail to a single UNIX address called websupport@mymachine.mydomain.com (name
changed to protect the innocent). The addressee "websupport" is an alias for
the "otrs" account. The mail sent to DL WEBSUPPORT correctly makes it into
OTRS, but I can't get it to go the correct queue. If I look at the e-
mail "to" line, I was expecting to see "websupport@mymachine.mydomain.com",
but instead I see:
To: "DL WEBSUPPORT"
participants (1)
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Stan McFarland