Abstract: The present invention relates to a system for an electronic mail enclosing a gift coupon and its transmitting method. A sender who intends to send an e-mail is connected to a Web server that offers an e-mail service and writes an e-mail message. A sender who has written an e-mail message transmits the message enclosing a gift coupon given a lottery number to a recipient. The recipient checks the e-mail and accepts receipt of the gift coupon. Related information of the recipient who accepts receipt of the gift coupon is stored in a database of a gift coupon providing server. The gift coupon providing server informs the recipient as to whether he or she has won a gift.