To provide a mail server which can simultaneously solve various problems caused by that information for supporting mail transmission is not provided from the mail server, in the case of transmitting a mail by using a conventional mail server.

This interactive mail server transmits image information for receiving a mail to a client in response to a mail transmitting request from the client, receives an electronic mail and the transmission request of the electronic mail with its destination address via the receiving image, and transmits the received mail to the destination address.