Yes, ask ("tell") any listserv
 
get listownr refcard
 
 
In your case, you "forgot" the token "for" between "nomail" and
the "userid"
 
Hopefully, you did not end the userid@node with a period.
 
Thus, the command should have been
 
         set MEDLAB-L nomail FOR [log in to unmask]
 
assuming a valid userid@node
 
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