The DEL syntax is different than the ADD.
To DEL, issue
 
DEL listname userid@node
 
e.g.,
 
DEL agesmart  [log in to unmask]
DEL agesmart  [log in to unmask]
 
--  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"