Link Logger
Premium,MVM
join:2001-03-29
Calgary, AB
 ·Shaw
| reply to sonofjay
Re: Killing a fly with a jackhammer
While this will help as there are lots of open email servers out there, it will not stop spam, as sonofjay is correct that other ports are used to bounce spam (559 and 65506 are two very common virus installed proxies and I would bet filtering those two ports would have more of an effect then filtering port 25).
The only solution is to go after the infected systems and spam servers spewing out this junk, but right now I'm happy to see someone trying something to help.
Blake
--
Vendor: Firewall Logging Software »www.SonicLogger.com - SonicWall and 3Com »www.LinkLogger.com - Linksys, Netgear and Zyxel |
|
Steve
I'm a PC, so shut up
Consultant
join:2001-03-10
Yorba Linda, CA
| Huh?
Blocking inbound 25/tcp to Comcast subscribers would have the effect you suggest - use a different proxy port - but I believe we're talking about blocking outbound 25/tcp. This will stop all email coming from these infected machines.
Steve
--
Stephen J. Friedl * Security Consultant * Tustin, California USA * my web site |
|
nixen
Rockin' the Boxen
Premium
join:2002-10-04
Alexandria, VA
·Cox HSI
 ·Speakeasy
| reply to Link Logger
said by Link Logger  :
While this will help as there are lots of open email servers out there, it will not stop spam, as sonofjay is correct that other ports are used to bounce spam (559 and 65506 are two very common virus installed proxies and I would bet filtering those two ports would have more of an effect then filtering port 25).
The only solution is to go after the infected systems and spam servers spewing out this junk, but right now I'm happy to see someone trying something to help.
Your argument makes no sense. It doesn't matter where a proxy listens. If it's trying to reach an SMTP system outside of a blocked network, then blocking port 25 outbound is STILL going to destroy the effectiveness of that proxy.
-tom
--
"There are 10 types of people in the world... those who understand binary and those who don't."
"That's only 2 types of people, moron" |
|
