When our Domino server configuration document is set to route mail out through a relay host it works great. The email is all generated from Notes clients using Notes mail. Nobody is actually using an SMTP client to connect to our Domino server. Our Domino server authenticates with the Mail relay host at an external ISP no problem.. 

The external recipients  on the Internet can see that the sender of message was authenticated. In fact it was our Domino server that was authenticated with the ISP's Relay server but that's fine.

Here is an example from a received header (names/addresses altered)

X-Authenticated-User: kong.acme.com
Received: from secure.acme.com (secure.acme.com [208.219.64.139])
	(authenticated bits=0)
	by mail143c7.googamailservers.com (8.14.9/8.13.1) with ESMTP id v4I3u7OS013659;
	Wed, 17 May 2017 23:56:09 -0400

 

We have a requirement to stop routing mail via a 3rd party ISP Relay server. Turning off mail relay in the configuration document works fine and the email routes directly to the recipients. However, the external internet recipients do not see any evidence in the received header that the sender was authenticated. In other word there is no X-Authenticated-User entry. I am concerned that some mail providers will gray or black list messages from us, or Spam trappers will be more likely to tag us because our senders appear to be unauthenticated. Of course they authenticated with the Domino server/Notes client but that awareness is not transmitted to SMTP.

Does anybody have any suggestions? I tried entering [127.0.0.1] as a Relay Host in the configuration document but got error message when trying to send.

Thank you in advance,

TBR