Patent ID: 8549194

Claim:
A data transmission apparatus having a data transmission function to the outside, comprising: a controller; a transmission-permitted address acquiring unit that acquires information on a transmission-permitted address that is an address to which data transmission is permitted; a transmission destination designation input receiving unit that receives an input for designating a first address; a first determination unit that determines, before data transmission to the first address, whether or not the designated first address has a possibility of being forwarded to a second address which is different from the first address; a forward destination information acquiring unit that acquires information of a forward destination corresponding to the designated first address when it is determined that the designated first address has the possibility of being forwarded to the second address; a second determination unit that determines, before data transmission to the first address, whether or not the acquired forward destination includes an address to which the data transmission is not permitted based on the transmission-permitted address acquired by the transmission-permitted address acquiring unit; and a cancel unit that, when it is determined that the forward destination includes an address to which the data transmission is not permitted, cancels the data transmission to the address to which the data transmission is not permitted, wherein when the first address is an address of a mailing list, the controller automatically deletes addresses in the mailing list to which the data transmission is not permitted and sets any of the addresses in the mailing list which are transmission-permitted addresses as first addresses, and wherein the cancel unit ceases all of the data transmission when the forward destination includes any one address to which the data transmission is not permitted.