You can request a return receipt by adding in the appropriate header. See
this Entourage FAQ article for complete instructions:
<
http://www.entourage.mvps.org/faq_topic/return_receipt.html>
However, be aware that many clients (including Entourage) ignore the header,
and other clients choose not to obey it. So you shouldn't expect to receive
a notification in all instances.
If you want Entourage to recognize these requests in incoming messages, go
to Tools > Rules, and create a new rule like this:
* Execute actions if any criteria are met
IF Specific Header Disposition-Notification-To Contains @
IF Specific Header Return-Receipt-To Contains @
THEN Reply
You can click the "Reply text" button and customize the notification text.
I only have such a rule set up to change the category of messages that
request receipts so that I have the option to send replies or not. You
might want to consider that option for your own privacy.