[118558] in North American Network Operators' Group
Re: ISP port blocking practice
daemon@ATHENA.MIT.EDU (Chris Boyd)
Fri Oct 23 11:26:43 2009
From: Chris Boyd <cboyd@gizmopartners.com>
In-Reply-To: <4761eff1fe5f8c51a625d6a3396bd4f8@yyc.orthanc.ca>
Date: Fri, 23 Oct 2009 10:25:56 -0500
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Oct 22, 2009, at 6:14 PM, Lyndon Nerenberg (VE6BBM/VE7TFX) wrote:
> My experience is that port 587 isn't used because ISPs block it
> out-of-hand. Or in the case of Rogers in (at least) Vancouver, hijack
> it with a proxy that filters out the AUTH parts of the EHLO response,
> making the whole point of using the submission service ... pointless.
We use 587 quite a lot (with SMTP Auth and SSL/TLS), and have found
_very_ few places block or proxy it. We don't have any/many customers
in Rogers service areas though.
The biggest reason people don't use it is that it requires some
thought and tweaking settings in the "advanced" tab areas of many
email clients. Newer email clients are actually starting to look for
submission port and SSL support and configuring it autmatically if
they find it.
Once it's set up correctly we've found customers really like it since
their email "just works" in most places.
--Chris
