You can use the Receipts tab in the Windows Mail Options dialog box to choose whether to send and respond to read receipts. Read receipts can notify you when a recipient reads your e‑mail. To access the Receipts tab:
Open Windows Mail by clicking the Start button , clicking All Programs, and then clicking Windows Mail.
Click the Tools menu, click Options, and then click the Receipts tab.
Under Requesting Read Receipts, select the Request a read receipt for all sent messages check box if you'd like to request a read receipt for every message you send. Note that most e‑mail programs allow the recipient to choose not to send a read receipt, so asking for a read receipt doesn't guarantee that you'll be notified when your message is read.
Under Returning Read Receipts, you can choose one of the following options:
Click Never send a read receipt if you don't want to send read receipts when senders request them.
Click Notify me for each read receipt request if you want to decide whether to send a receipt each time one is requested.
Click Always send a read receipt to automatically send a requested receipt whenever you read a message. Note that choosing this option could possibly alert junk e‑mail senders that you've read their messages.
Secure receipts work just like read receipts. The only difference is that they're used with digitally signed e‑mails. Click Secure Receipts to choose whether to request receipts with digitally signed messages, and to set your options for responding to requests for digital signatures.