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 an e-mail; a determination unit for determining whether or not the 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 e-mail is an e-mail instructing one-touch key registration, obtaining from the e-mail mailing information including at least recipient information and one or more files attached to the e-mail; a storage unit for storing the mailing information and the files obtained by the obtaining unit; an association unit for associating the mailing information and attached file information with a one-touch key, wherein the attached file information comprises information pertaining to the 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 a one-touch key, reading the mailing information and the attached file information associated with the one-touch key, creating an e-mail to which are attached one or more files corresponding to the attached file information and the image file created during original document reading, and sending the e-mail to a recipient corresponding to the recipient information included in the mailing information.