exim: Always set the Sender: header... ?

I am wondering what exactly is this option doing?

Always set the Sender: header when the sender is changed from the actual sender. (Unchecking this will stop "On behalf of" data in Microsoft(R) Outlook, but may limit your ability to track abuse of the mail system.)


I think that I understand the first part "Always set the Sender: header" but what is this other part mean I have no idea "Unchecking this will stop "On behalf of" data in Microsoft(R) Outlook"

This option is currently unchecked so I am not shure if I enable it how would that affect Outlook users.

[airoid]

In Outlook, when you open a new e-mail message, you have the option to set the "From" e-mail address. This could be completely different than your e-mail address.

By setting "From," it makes it look like the e-mail message came from that e-mail address instead of yours. (I believe your real e-mail address is sent along with the message in the headers somewhere).

Ok, yes I understand that part it will add "sender" in header, but what is this other part mean "will stop "On behalf of" data in Microsoft(R) Outlook".

[airoid]

The process I described above is what they are referring to. "On behalf of" is the outlook feature of sending a message "on behalf of" another e-mail address. It means the system won't allow it if you uncheck that.

Sorry, my English is not perfect, so that's probably why I didn't understood that.

Thank you.