Well-Known Member
Jan 22, 2005
You'd probably notice that this only appears to be the case if viewing the received mail through Outlook.

Try unchecking:

"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.)"

in the basic Exim configuration editor in WHM.
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