No, no, no!  The easiest and most efficient way is to add them with a
command job (as Eric said earlier).  We don't advocate manually editing
the subscriber list except as a last resort.
 
All you have to do is get your ducks in a row and tag the command job
around them:
 
//ADDLOTS JOB Echo=No
QUIET ADD listname DD=Users
//Users DD *
[log in to unmask] Joe User
[log in to unmask] Jane User
.....
/*
 
Then send it to LISTSERV.  How hard is that?  :)
 
Nathan