The long answer to that question can be had by e-mailing
the following to: [log in to unmask]
 
/* --------------------- clip and save ---------------- */
//ListSrch JOB Echo=no
Database Search DD=Rules OUTLIM=4000 f=mail
//Rules DD *
S * IN LSTOWN-L SINCE 94 WHERE SENDER CONTAINS -
  (klassen or eric or pmw1 or winship)
print
/*
//  EOJ
/* --------------------- clip and save ---------------- */
 
 
The short answer is that it is an list-owner initiated list
definition that prevents problem subscribers (or automated
processes such as postmasters) from e-mailing your list.
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
[log in to unmask]    "Are cycle-stealers thieves? ;-)"   +1 814 863 1843
31 Shields Bldg. -- Penn State Univ -- University Park, PA 16802-1202 USA