Authenticated outgoing email

RT Users
1

Hi,

I am successfully using rt50 which imports tickets from email for several queues by means of fetchmail/pop3 from exchange server, while sending email over local postfix.

I would like to implement authenticated email sending over exchange server.

Is this possible with rt?

I tried some setups but failed. I can provide more info if needed.

Thank you in advance.

2

Does your exchange instance allow SMTP relay? You can install Postfix and configure the relay for outgoing

3

That’s how I do it now. Local postifix relays to exchange by means of allowlisted IP address in its receive connector, which makes exchange accept all emails from that IP address.

I would like to avoid allowlisting in exchange, and have RT submit messages to local dma which would then submit emails to exchange, authenticated.

dma’s auth.conf is as follows:

queue1@example.org|exchange.example.org:somepassword
queue2@example.org|exchange.example.org:somepassword

When I submit mail with sendmail -f queue1@example.org recipient@example.org it gets correctly authenticated by exchange and delivered to recipients mailbox. But it doesn’t work from rt. I get:

exchange.example.org [192.0.2.145] did not like our final DATA:
550 5.7.60 SMTP; Client does not have permissions to send as this sender

Message headers follow.

Received: from www (uid 80)
(envelope-from queue1@example.org)
id d29f
by rt.example.org (DragonFly Mail Agent v0.13+ on rt.example.org);
Tue, 13 Oct 2026 18:53:22 +0200
X-Managed-BY: RT 5.0.10 (http://www.bestpractical.com/rt/)
X-RT-Ticket: example.org #31417
Subject: [queue1 #31417] Test 9
In-Reply-To:
Auto-Submitted: auto-replied
References: RT-Ticket-31417@example.org
Content-Type: text/html; charset="utf-8"
X-RT-Loop-Prevention: example.org
From: "SomeRTUser putem tiketing sistema" queue1@example.org
To: some.recipient@example.org
Message-ID: rt-5.0.10-5035-1791910402-144.31417-1-0@example.org
Reply-To: queue1@example.org
X-RT-Originator: some.rtuser@example.org
Content-Transfer-Encoding: quoted-printable
X-RT-Original-Encoding: utf-8
Precedence: bulk
Date: Tue, 13 Oct 2026 18:53:22 +0200
MIME-Version: 1.0

RT’s configuration for outgoing mail is minimalist:

Set( $MailCommand, 'sendmailpipe');
Set( $SendmailPath, '/usr/sbin/sendmail');

Any ideas how to troubleshoot?