Ignoring subscription mail

[Markus Schoeller <ms @ specklec . mpifr-bonn . mpg . de>]

Dear Majordomo Users!

Since my list is one of about twenty which are abused
for mailbombing techniques, I want to know if it is
possible to let majordomo ignore subscription requests
from several users, or even better, to let it ignore
subscription requests that came through certain mailing
sites.

Markus, trying to track and destroy the e-mail bomber