1. An image forming apparatus comprising: an image reader for creating an image file by reading an original document; an operation unit that includes one-touch keys that receive selection operations carried out by a user; a receiving unit for receiving a first e-mail; a determination unit for determining whether or not the first e-mail received by the receiving unit is an e-mail instructing one-touch key registration; an obtaining unit for, where it is determined by the determination unit that the received first e-mail is an e-mail instructing one-touch key registration, obtaining from the first e-mail mailing information including at least recipient information and one or more files attached to the first e-mail; a storage unit for storing the mailing information and the one or more files obtained by the obtaining unit; an association unit for creating a new one-touch key on the display device and associating the mailing information and the attached file information with the created one-touch key when it is determined by the determination unit that the received first e-mail is an e-mail instructing one-touch key registration, wherein the attached file information comprises information pertaining to the one or more attached files; and a controller for, where reading of an original document by the image reader is specified by a selection operation carried out using the created one-touch key, reading the mailing information and the attached file information associated with the created one-touch key, creating a second e-mail to which are attached the one or more files corresponding to the attached file information and the image file created during original document reading, and sending the second e-mail to a recipient corresponding to the recipient information included in the mailing information; wherein the operation unit comprises a display device for displaying the one-touch keys.