E-mail address change notification deputization system and e-mail address change notification deputization method

摘要

An e-mail address change notification deputization system has a first provider server in which a first e-mail address of a client is set; ;a second provider server in which a second e-mail address of the client is set; and ;an address change notification deputization service server, ;wherein the first provider server transfers an e-mail that is sent to the first mail address to the second provider server upon receiving this e-mail, ;wherein the second provider server transfers an e-mail that has been transferred from the first provider server to the address change notification deputization service server upon receiving this e-mail, and ;wherein the address change notification deputization service server checks the path of the e-mail that has been transferred from the second provider server and makes a notification to the sender of the e-mail to the effect that the e-mail address of the client is the second mail address in the case that this e-mail is received by the second provider server after transfered by the second provider server.