An image forming device for transmitting and receiving an email message and a method for transmitting and receiving an email message by an image forming device. The image forming device includes a communication unit, a memory unit, an email processing unit, an email preparing unit, and a controller. The communication unit is connected to a network connected to a predetermined terminal device and performs data communication with the terminal device. The memory unit stores a pre-processed data file. The email processing unit detects the content of any email messages that are transmitted from the terminal device and received through the communication unit. The email preparing unit prepares an email message to be transmitted to the terminal device. If the content of the email message includes a data transmission command that requests the sending of a first data file among data files stored in the memory unit, the controller controls the email preparing unit and the communication unit to prepare and transmit an email message attaching the first data file. Accordingly, it is possible for a user to easily copy data from the image forming apparatus to the terminal device.