Blocking email destined for Exchange

[Max Kipness]

We continuously get a spam email addressed to dazed at ourdomain.com that
ends up going to several recipients. I can't figure how this occurs as
Sendmail (as the gateway) only shows the recipient as being
dazed at ourdomain and does not show any other recipients, yet it ends up
in several mailboxes, including mine at times.
 
Anyway, is there a way to have Sendmail or MailScanner to block email to
a specific email address even if the email domain is not hosted locally?
All email for this domain is forwarded to an Exchange 2003 server using
a mailertable rule.
 
Thanks,
Max
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