[78231] in North American Network Operators' Group
Re: Why do so few mail providers support Port 587?
daemon@ATHENA.MIT.EDU (Nils Ketelsen)
Fri Feb 25 11:10:19 2005
Date: Fri, 25 Feb 2005 10:51:55 -0500
From: Nils Ketelsen <nils.ketelsen@kuehne-nagel.com>
To: nanog@merit.edu
Mail-Followup-To: nanog@merit.edu
In-Reply-To: <200502250436.j1P4aeut018228@turing-police.cc.vt.edu>; from Valdis.Kletnieks@vt.edu on Thu, Feb 24, 2005 at 11:36:40PM -0500
Errors-To: owner-nanog@merit.edu
On Thu, Feb 24, 2005 at 11:36:40PM -0500, Valdis.Kletnieks@vt.edu wrote:
> Well, OK. If you know for a *fact* that your users *never* roam, and you
> have sufficiently good control of your IP addresses that you can always safely
> decide if a given connection is "inside" or "outside" and allow them to relay
> based on that, then no, you don't need to support 587.
>
> The rest of us run mail services in the real world, where lots of users buy
> laptops, and then actually <gasp, shock> *use* the portability and thus often
> end up behind some other ISP's port-25 block.
I force anyone, who wants to relay to use SMTP-AUTH on port 25. Only mails
for local delivery are accepted without AUTH. Whats point
in opening another port?
I use this mailserver from a lot of different networks and it works fine.
If a provider blocks port 25 I call them, ask them to cahnge it, if they
don't I cancel my contract, because they don't do there Job (forwarding
IP).
Nils
