An electronic mailing method on the Internet with a function of reception confirmation is described. The method is comprising the steps of (a) assigning a unique code to the e-mail of a sender and recording the unique code in a database; (b) attaching to the e-mail a CGI executive program that automatically sends the unique code to the web server of the sender when the receiver receives the e-mail; (c) sending the unique code to the web server of the sender by the automatic execution of the CGI executive program when the e-mail is received by the receiver; and (d) comparing the unique code sent in the step (c) and the unique code recorded in the step (a) and, if they are identical, sending reception confirmation information to the sender.