Not unless the list-owner spoofs email ... which is probably a violation of a law or AUP. Alternatively, the list-owner could QUIET ADD the userid and then QUIET SET NOMAIL. Then give instructions to the user to do a SET listname MAIL Of course this is still kind of bogus, especially if the list-owner gets the userid@node somewhat incorrect i.e., the mail gets deliver to the intended recipient, who then can not generate email from that specific [log in to unmask]