North American Network Operators Group|
Date Prev | Date Next |
Date Index |
Thread Index |
Author Index |
How do you stop outgoing spam?
- From: Hank Nussbacher
- Date: Mon Sep 09 05:21:44 2002
Please try to keep this discussion technical and not diverge to
opinions. I am not looking for opinions or religion. I am trying to find
automated tools/systems/boxes that will stop spam from going *out* from an
ISP. The ISP has no servers and allocates IP address space to downstream
customers who spam. Yes, I know all about ACLs to block offending
IPs. The ISP is willing to buy any box or system to stop outgoing spams
and thereby stop constantly playing with ACLs.
The spamming is usually done (but not only) from an Internet cafe where the
spammer inserts a "spammer CD" and blasts away at open mail relays. When
SMTP is blocked for that IP, they switch to HTTP and send the spam via MSN,
Yahoo, Hotmail, Kukamail, Outblaze, Safe-mail, etc. to name just a
few. Blocking port 80 is harder since it requires maintaining an ever
larger list of free public web based mail systems or just block port 80
Technical solutions welcome.