A network facsimile device connected to the Internet or a local area network, employs an electronic mail function, and has a function of exchanging image information through said Internet or said local area network and functions of a facsimile device. The device comprises delivery notifying partner storing means for storing a mail address of a destination address to which a confirmation is to be delivered. Delivery confirmation mail confirming means detects, at a time of receiving electronic mail, whether the received electronic mail is an electronic delivery confirmation mail for confirming mail delivery. Delivery confirmation mail transferring means transfers said delivery confirmation mail confirmed by said confirming means to said destination address stored in said delivery notifying partner storing means.