nanog mailing list archives
Re: Is your ISP blocking outgoing port 25?
From: Joe Provo <nanog-post () rsuc gweep net>
Date: Thu, 18 Jun 2009 16:14:45 -0400
On Thu, Jun 18, 2009 at 03:36:44PM -0400, Zhiyun Qian wrote:
It has been long heard that many ISPs block outgoing port 25 for the purpose of reducing spam originated from their network.
Yes, it is standard practice for non-server accounts and most dynamic-only accounts; only allow unauthenticated smtp traffic to your own smtp servers. If you are not running server-to-server traffic at the end of that broadband pipe, then you should be shifting your userbase to authenticated on the SUBMIT port [587] anyway... -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
Current thread:
- Is your ISP blocking outgoing port 25? Zhiyun Qian (Jun 18)
- RE: Is your ISP blocking outgoing port 25? Paul Stewart (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Charles Wyble (Jun 18)
- RE: Is your ISP blocking outgoing port 25? Paul Stewart (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Charles Wyble (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Charles Wyble (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Paul M Moriarty (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Joe Provo (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Lyndon Nerenberg (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Christopher Morrow (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Jack Bates (Jun 18)
- Re: Is your ISP blocking outgoing port 25? Jeroen Wunnink (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Patrick W. Gilmore (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Jeroen Wunnink (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Sean Donelan (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Steven King (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Michael Thomas (Jun 19)
- Re: Is your ISP blocking outgoing port 25? Dave Pooser (Jun 20)
- Re: Is your ISP blocking outgoing port 25? Lyndon Nerenberg (Jun 18)
- RE: Is your ISP blocking outgoing port 25? Paul Stewart (Jun 18)