| 摘要 |
Tracking history of e-mail messages. A tracking request can be sent at any time, and need not be specified prior to or during the sending of the e-mail message. In one embodiment, tracking is requested by resending an earlier-sent message to the recipient, and associated with this resent message is a tracking request X-header. A recipient of the tracking request X-header responds by returning a reply X-header in a reply message along with tracking information pertaining to the original e-mail message. One alternative embodiment embeds an e-mail object in an e-mail message to request the tracking instead of using a request X-header, and similarly, uses an e-mail object to provide the reply instead of using a reply X-header. Users may be allowed to specify whether their e-mail client will respond to tracking requests and/or may be allowed to specify criteria for automating this decision.
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