>Yes, he signed onto all three of my mailing lists and then signed off all
>of them shortly afterward.  I'm fairly confident that he did it in order to
>snag the subscriber lists.
 
Seems unlikely.  As previously stated, we've already been over this on the
out-cast list Spam-L, where nothing of any interest is discussed.
Winternet.com acted very responsibly in kicking out a spammer.  The spammer
apparently tried to mail bomb them with list subs.