> envelope sender checking is the _norm_ outside of Qmail world.
[ ... ]
> it does stop its share of the bulk.
I took 30 envelope sender domains from Bruce Guenter's 1999 spam archive
and fed them through mail.sendmail.com:
aol.com is allowed.
vger.rutgers.edu is allowed.
gold.uni-miskolc.hu is allowed.
worldnet.att.net is allowed.
ibm.net is allowed.
yahoo.com is allowed.
worldnet.att.net is allowed.
yahoo.com is allowed.
site-promotion.com is not allowed: exists but has misconfigured DNS.
ibm.com is allowed.
aol.com is allowed.
sprint.ca is allowed.
hotmail.com is allowed.
email.mot.com is allowed.
1tin3.at is not allowed: doesn't exist in DNS.
hosted2u.net is allowed.
server-web.dsc.it is allowed.
ardennet.com is allowed.
mailix.vienna.at is allowed.
econ.vu.nl is allowed.
econ.vu.nl is allowed.
ibm.net is allowed.
megasuccess.net is allowed.
snailmail.the-continuum.net is allowed.
vger.rutgers.edu is allowed.
vger.rutgers.edu is allowed.
vger.rutgers.edu is allowed.
year2000ideas.net is allowed.
aol.com is allowed.
alsa.jcu.cz is allowed.
The original 30 pieces of spam have been slashed to a mere 28. Amazing!
---Dan
