Re: Blocking port 25 outbound

[Liliana Moisa <lmoisa () MEMPHIS EDU>]

We have done this two years ago. We have access lists on the core
switches, letting only a few "official" mail servers to send mail in
Internet.

First two weeks were harder, until all the Campus knew that they had to
use only known mail servers.

 

It was a good opportunity to find computers that had their "own SMTP
engine" - infected with different viruses/worms that wanted to propagate
further.

 

Liliana Moisa

Network Security Specialist

University of Memphis

901 678 3001

 

 

________________________________

From: Lazor, Joseph [mailto:JLazor () ADMIN FSU EDU] 
Sent: Monday, August 22, 2005 2:30 PM
To: SECURITY () LISTSERV EDUCAUSE EDU
Subject: [SECURITY] Blocking port 25 outbound

 

Hello out there,

 

We are considering blocking all port 25 traffic outbound.  We have noted
various ISP's and others moving to block port 25 outbound to reduce
"spamming".  We wish to be good "netizens"

Have any of you done this already and what has been the push back of
issues related to implementation on your campus?

 

Regards,

 

Joseph A. Lazor

Florida Sate University