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 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 .