Laurie:
 
It is very touch to filter out the random single SPAMMER,
similar to the determined terrorist.
 
Unless you want to approve each new subscriber, or perhaps
have a subscriber option of REVIEW (default-options=review,
which you then have to approve their first few posts while
they are are on new-subscriber "probation"), then you will
leave yourself open to the determined.
 
--  co-owner:   INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
URL:mailto:[log in to unmask]                "I get paid by the millisecond"