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Mail On the Mail page in the Hyperlink dialog you can edit hyperlinks for e-mail addresses.

Mail Recipient Assigns the specified e-mail address to the hyperlink. Clicking the new hyperlink in the document will open a new message document, addressed to the receiver specified in the Recipient field. Data Sources Hides or shows the data source browser. Drag the receiver's E-mail data field from the data source browser into the Recipient text field. Subject Specifies the subject that is inserted in the subject line of the new message document.