Mailing List Message #92246
From: Karl Zander <>
Subject: Re: port 587 and authentication
Date: Wed, 15 Aug 2007 22:29:02 -0400
To: CommuniGate Pro Discussions <>
X-Mailer: CommuniGate Pro WebUser v5.1.8
On Wed, 15 Aug 2007 16:13:18 -0700
 Thom O'Connor <> wrote:
From:   Jeremy Webber

SMTP Authentication is usually always offered. The client MTA or MUA may
choose to use it, or not. If the client MTA/MUA does not authenticate,
then CommuniGate Pro checks the (1) source IP of the connection and the
(2) recipient. If the recipient is a local address, the MTA (such as
CommuniGate Pro) by default always accepts the message.

This is how Internet-based e-mail functions on all "non-Client-IP" (and
non-relay) SMTP traffic.

So, in short - you don't need to configure SMTP Auth at all. Just
configure these SMTP Listener ports:

Port     Init SSL/TLS
25       off
465      on
587      off

And you're ready to go...

I'm confused....for a domain, the Domain Settings offer an option to "Force SMTP AUTH for:" for nobody, non-clients, clients, everybody.  Is that not forcing the use of SMTP AUTH if non-clients, clients or everybody is selected?

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