| 摘要 |
The invention consists in inserting a code in an appropriate e-mail message type to automatically generate a request over a communication network as soon as the message is displayed by its recipient. The request consists in recalling a uniquely named file, or a page (URL) whose parameter is a unique code on a certain server. This file name or unique code corresponds to a previously created record. Then, the system may select this record and send its issuer a notice that the corresponding message was actually displayed by the recipient.
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