| 摘要 |
PROBLEM TO BE SOLVED: To manage mail opening situations without depending on an electronic mail protocol by adding a unique code to an electronic mail to be sent, analyzing the data stream of the electronic mail in a computer system that receives it and returning an open notification mail to an electronic mail sender. SOLUTION: A data stream of an electronic mail is analyzed at the time of transmitting the electronic mail, a unique code is added to a subject in a computer system that transmits the electronic mail, and the electronic mail is transmitted. And in a computer system that receives it, the data stream of the electronic mail is analyzed and an opening notification mail is returned to the electronic mail sender. In the system, a processor 10 to be used by the mail sender is provided with an opening state display program 4 which shows the opening state of a transmitted electronic mail, etc. When a processor 11 for receiver analyzes the subject of a received mail and needs an opening notification, it is provided with a receiving mail program 3 which returns an open notification mail, etc. |
