MAIL TRANSMISSION SERVER, MAIL TRANSMISSION METHOD, MAIL TRANSMISSION PROGRAM, RECORDING MEDIUM, MAIL ALTERATION DEVICE, MAIL ALTERATION METHOD, AND MAIL ALTERATION PROGRAM

摘要

This mail transmission server (10) receives an email, for which at least one destination address has been set, from a client and transmits the email to a mail reception server to which the domain of the destination address is assigned. The mail transmission server is equipped with a transmission control section (131), and in the event that at least one destination address has a domain not included in a predetermined verification-unnecessary domain group which includes the domain assigned to the mail transmission server, the transmission control section (131) permits transmission of the email to the mail reception server if the value of a verification header field includes predetermined verification information, or prohibits transmission of the email to the mail reception server if the value of the verification header field does not include such verification information.