Patent ID: 8615657

Claim:
An e-mail sending method, comprising the steps of: causing a receiver's mailer AML to set a receiver's e-mail address in a sender's field and to send an e-mail to a mail server AMS, in response to inputting of a sender's address in a destination field of the receiver's mailer AML; generating an e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and rewriting the sender's field to be filled in with the LD address; causing the mail server AMS, in response to any one of creating of a user extension field by a mail server AMS and creating of a user extension field by a receiver, to write a receiver's alias in the user extension field; causing the mail server AMS to send an e-mail having the user extension field to a mail server BMS; causing the mail server BMS to send an e-mail to a sender; causing a sender's mailer BML to receive the sent e-mail; causing the sender's mailer BML to recognize the user extension field, and to create a table having the contents of the user extension field regarded as a key and the contents of the sender's field regarded as a value; and causing the sender's mailer BML to rewrite the sender's field to be filled in with the contents of the user extension field, and to show the rewritten contents to a user.