Educause Security Discussion mailing list archives
Re: Blocking port 25 outbound
From: CHARLES MORROW-JONES <morrow-jones.2 () OSU EDU>
Date: Mon, 22 Aug 2005 15:59:05 -0400
This is probably obvious, but find out who is using port 25 before you block it, and don't rely on a few weeks of flow data to tell you the whole story. We recently did a survey of our departmental network administrators asking them to list machines that send mail, and many hosts appeared on the list that only send mail occasionally (as an example, an administrative department that sends out quarterly satisfaction surveys). Charles R. Morrow-Jones Director, Security Office of the CIO The Ohio State University morrow-jones.2 () osu edu -or- 614.292.1302 ----- Original Message ----- From: "Lazor, Joseph" <JLazor () ADMIN FSU EDU> Date: Monday, August 22, 2005 3:29 pm Subject: [SECURITY] Blocking port 25 outbound
Hello out there, We are considering blocking all port 25 traffic outbound. We have notedvarious 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)
(Thread continues...)