North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

RE: Why do so few mail providers support Port 587?

  • From: Erik Amundson
  • Date: Tue Feb 15 21:54:48 2005

I just get sick of providers blocking traffic...their job is to PASS
TRAFFIC.  There must be a better solution, but laziness is getting the
better of us all, as usual.

We've had so many problems with "IP Providers" blocking various "IP
PROTOCOLS" that we've just ended up forcing all of our users to use VPN
tunnels for everything...except when the providers block that!!!  Then
we're just screwed.

Anyways, just my two cents...

Please don't flame me, I'm just a lowly network guy....:)

- Erik

-----Original Message-----
From: Sean Donelan [mailto:[email protected]] 
Sent: Tuesday, February 15, 2005 8:00 PM
To: [email protected]
Subject: Why do so few mail providers support Port 587?

Although RFC2476 was published in December 1998, its amazing how few
mail providers support the Message Submission protocol for e-mail on
Port 587.  Even odder, some mail providers use other ports such as 26 or
2525, but not the RFC recommended Port 587 for remote authenticated mail
access for users.

Large mail providers like AOL, GMAIL and Yahoo support authenticated
mail on port 587; and some also support Port 465 for legacy SMTP/SSL.
But a lot of universities and smaller mail providers don't.  They still
use SMTP Port 25 for roaming users.  With AT&T, Earthlink, COX, Netzero
and other ISPs filtering port 25 for years, I would have thought most
mail providers would have started supporting Port 587 by now.

What can be done to encourage universities and other mail providers with
large roaming user populations to support RFC2476/Port 587?
What can be done to encourage the mail client software programers (i.e.
Outlook, Eudora, etc) to make Port 587 the default (or at least the
first try) and let the user change it back to port 25 (or automatically
fallback) if they are still using a legacy mail server.

Sendmail now includes Port 587, although some people disagree how its
done.  But Exchange and other mail servers are still difficult for
system administrators to configure Port 587 (if it doesn't say click
here for Port 587 during the Windows installer, its too complicated).