[115400] in North American Network Operators' Group
Re: Is your ISP blocking outgoing port 25?
daemon@ATHENA.MIT.EDU (Joe Provo)
Thu Jun 18 16:15:27 2009
Date: Thu, 18 Jun 2009 16:14:45 -0400
From: Joe Provo <nanog-post@rsuc.gweep.net>
To: nanog@nanog.org
In-Reply-To: <01aa01c9f04c$1d0a8820$e76ed48d@zhiyunpc>
Reply-To: nanog-post@rsuc.gweep.net
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
