A communication apparatus having a filter function of rejecting mail reception from an address that differs from a permitted address specified beforehand, includes: a transmission unit configured to transmit a mail to a predetermined mail address that differs from the permitted address; a first storage unit configured to store a mail address of a destination; a judging unit configured such that, when there is an incoming mail from a mail address that differs from the permitted address, the judging unit judges whether or not the mail address of the transmitter of this incoming mail matches a mail address thus stored; and a receiving unit configured such that, in a case in which the judging unit has judged that the mail address of the incoming mail matches that thus stored, the receiving unit receives this incoming mail.