[msexchange] Email Blocking

I use Exchange Server 5.5 IMS Message filtering to block email by domain.
I, like everyone else, get UCE daily. 
One day it will come from: @mail20.C0olmail.com
Next day it will come from: @mail201.C0olmail.com
Next day: @mail202.C0olmail.com

And so on.....
Is there a way to set the blocking in the IMS for all of the incarnations of
this domain (20,201,202,203,305...) in one shot, or do I just have to add
each individually every day?
Wildcards wouldn't work, would they?
TIA,
Mike





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