APOP is just an authentication scheme that works under POP3.
  MH supports it, so you get exmh, mh.el, etc. I don't recall if NMH retained 
APOP still..

] Train travel features AC outlets with no take-off restrictions|  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [