From OE's Help files (receipts)

  Stuartli 16:45 15 Oct 2003

To be notified when your outgoing messages are received

You can set up Outlook Express to display a receipt for e-mail you send. The receipt is sent when the message recipient has displayed your message. This is useful when you are sending time-critical information, or any time you want confirmation that your message has been received.

To request a receipt for individual messages

In the new message window, on the Tools menu, click Request Read Receipt.
To request a receipt for all messages

On the Tools menu, click Options.
On the Receipts tab, select the Request a read receipt for all sent messages check box.

Note

Message recipients can choose not to send read receipts, even when they are requested. If you do not want to send receipts, on the Tools menu, click Options. On the Receipts tab, select a Returning Read Receipts option.

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