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"Send on behalf" query

Last Modified: 2015-01-05

Our setup is as below:

Application server (running IIS) > Sendmail relay > Exchange (Internal)/Internet

Our mail domain is domain.com. The Sendmail relay is configured to reject mail with a MAIL FROM: address of @domain.com (since only Exchange should use this, not application servers).

We have an application on a server named App1 that needs to send email on behalf of a user. So, we were thinking of using the Send on Behalf functionality. Therefore, the application would send mail with:

From: user@domain.com
Sender: application@app1.domain.com

Have I got these the right way around?

Also, we need to ensure that the MAIL FROM: is not @domain.com. Does anyone know, when an application sends email - is the MAIL FROM: derived from the From: or Sender:, or does this purely depend on the application?
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