Using Internet Fax (I-Fax) 

The Internet Fax (I-Fax) function allows you to send and receive faxes over the Internet. Originals are sent attached as TIFF images files to e-mail. Since a telephone connection is not used, you can send faxes to distant locations and send documents with many pages without worrying about communications charges. Some advance preparation is required, such as specifying the mail server settings.  Configuring Scan Settings (Sending E-mail, Sending & Receiving I-Faxes)