http://www.rfc-editor.org/rfc/rfc2305.txt
RFC 2305: A Simple Mode of Facsimile Using Internet Mail, K. Toyoda, H. Ohno, J. Murai, D. Wing1998-03-01T23:00:00-00:00This specification provides for "simple mode" carriage of facsimile data over the Internet. [STANDARDS-TRACK]