Return Receipts for Entourage 2004

Note: this will request a return receipt for EVERY mail:

Entourage doesn't include the ability to request a return receipt on a
message-by-message basis, but you can add the header manually to your
account. Go to Tools > Accounts, and open your mail account. Click the
"Options" tab, and under "Additional Headers", type in
"Disposition-Notification-To" (without the quotes) under Header, and your
e-mail address under Value.