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An S/MIME (S/MIME: Secure Multipurpose Internet Mail Extensions (S/MIME) is a specification for secure e-mail messages that uses the X.509 format for digital certificates and uses various encryption algorithms such as 3DES.) receipt is an e-mail security feature used to request confirmation that a message was received unaltered. It also includes information about who opened the message and when it was opened. This verification information is returned as a message in your Inbox. You can configure Microsoft Office Outlook 2007 to send your messages with an S/MIME receipt request.

• Send a single message with an S/MIME receipt request

• Send all messages with an S/MIME receipt request

Send a single message with an S/MIME receipt request

1. In the message, on the Message tab, in the Options group, click the Message Options Dialog Box Launcher .
2. Click Security Settings.
3. Select the Add digital signature to this message check box.
4. Select the Request S/MIME receipt for this message check box.
5. Click OK two times.
6. Send your message.

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Send all messages with an S/MIME receipt request

1. On the Tools menu, click Trust Center, and then click E-mail Security.
2. Under Encrypted e-mail, select the Add digital signature to outgoing messages check box.

3. Select the Request S/MIME receipt for all S/MIME signed messages check box.

4. Click OK two times.
5. Send your message.

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