Educause Security Discussion mailing list archives
Re: Blocking port 25 outbound
From: Michael Grinnell <grinnell () AMERICAN EDU>
Date: Mon, 22 Aug 2005 16:03:17 -0400
We have. Keep in mind it's not a panacea, but it does help with the outbound spam volume. Make sure you publicize it a lot before doing so. Once you do this, you still need to check who's sending large volumes of mail through your mailserver, as some spam bots are smart enough to find it and use it. Also, it helps to set up SMTP AUTH first. That way, your users can set their email programs to always use your outbound mail server, and they won't have to keep changing their outbound mail server when they move on and off campus.
Michael Grinnell Network Security Administrator The American University e-mail: grinnell () american edu On Aug 22, 2005, at 3:29 PM, Lazor, Joseph wrote:
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
Current thread:
- Blocking port 25 outbound Lazor, Joseph (Aug 22)
- <Possible follow-ups>
- Re: Blocking port 25 outbound Aaron Childs (Aug 22)
- Re: Blocking port 25 outbound Liliana Moisa (Aug 22)
- Re: Blocking port 25 outbound Randy Marchany (Aug 22)
- Re: Blocking port 25 outbound CHARLES MORROW-JONES (Aug 22)
- Re: Blocking port 25 outbound Michael Grinnell (Aug 22)
- Re: Blocking port 25 outbound Information Security (Aug 22)
- Re: Blocking port 25 outbound Michael Halm (Aug 22)
- Re: Blocking port 25 outbound Joe St Sauver (Aug 22)
- Re: Blocking port 25 outbound Information Security (Aug 22)
- Re: Blocking port 25 outbound Information Security (Aug 22)
- Re: Blocking port 25 outbound Trevor J Corbett (Aug 22)
- Re: Blocking port 25 outbound Christopher E. Cramer (Aug 22)
- Re: Blocking port 25 outbound Jason Richardson (Aug 22)
- Re: Blocking port 25 outbound Scott Genung (Aug 22)
- Re: Blocking port 25 outbound Matthew Keller (Aug 22)
(Thread continues...)