Ron Shorts

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You might be interested how email authentication works in case of Smart Host services<br />
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Check out below - article originally return for Azure but fully explore how SMTP relay services pass SPF, DKIM and DMARC on behalf of you for messages sent by you.<br />
<a href="https://www.experts-exchange.com/articles/32747/Azure-SMTP-Restrictions-Resolution-with-SMTP-Relay-Services.html" rel="ugc">https://www.experts-exchange.com/articles/32747/Azure-SMTP-Restrictions-Resolution-with-SMTP-Relay-Services.html</a>
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You might be interested how email authentication works in case of Smart Host services

Check out below - article originally return for Azure but fully explore how SMTP relay services pass SPF, DKIM and DMARC on behalf of you for messages sent by you.
https://www.experts-exchange.com/articles/32747/Azure-SMTP-Restrictions-Resolution-with-SMTP-Relay-Services.html [https://www.experts-exchange.com/articles/32747/Azure-SMTP-Restrictions-Resolution-with-SMTP-Relay-Services.html]

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Recently had some email messages that were being sent via Exchange through smtp relay from another system, and the reply address or from was always <b>Postmaster@domain.com</b><br />
<br />
During a brief period, instead of Postmaster@domain.com, this was replaced with user1@domain.com, and then switched back.<br />
<br />
Looking at the message headers, I noticed the <b>Return-Path</b> was changed during this period listing user1@domain.com<br />
<br />
Would there be a valid reason why an admin would change this?<br />
<br />
Thanks in advance
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Recently had some email messages that were being sent via Exchange through smtp relay from another system, and the reply address or from was always Postmaster@domain.com

During a brief period, instead of Postmaster@domain.com, this was replaced with user1@domain.com, and then switched back.

Looking at the message headers, I noticed the Return-Path was changed during this period listing user1@domain.com

Would there be a valid reason why an admin would change this?

Thanks in advance

Exchange, Postmaster and Return-Path

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.