New answers tagged smtp-relay
You didn't say whether these were your users or external users, nor the Exchange version. My links are 2007 because that's what I support, so I had them lying around my bookmarks. By default Exchange is set up with integrated security (using the logged-in user's AD credentials). Your app presumably doesn't have any, or doesn't pass them. This is a common ...
If you can't authenticate anonymous relay is it..."From:" is part of the SMTP message, not the authenticated sender, btw. The document you point to is pretty old - Exchange 2000 and 5.5. These days you'd do it with New-ReceiveConnector from the EMC (I don't recall the GUI procedure) but it's the same idea. EDIT: See this technet link
Some mail systems may have slightly different methods, but in general, this is what happens. Recipient domain checked for local: If the recipient mail domain is handled by this MTA, then any aliases are expanded. If it is still local, it is delivered, and the process stops. Recipient domain checked for explicit route: If an explcit SMTP route is defined ...
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