"This document describes extensions to ""Simple Mode of Facsimile Using Internet Mail"" [RFC2305] and describes additional features@ including transmission of enhanced document characteristics (higher resolution@ color) and confirmation of delivery and processing. These additional features are designed to provide the highest level of interoperability with the existing and future standards-compliant email infrastructure and mail user agents@ while providing a level of service that approximates the level currently enjoyed by fax users. The IETF has been notified of intellectual property rights claimed in regard to some or all of the specification contained in this document. For more information consult the online list of claimed rights in http://www.ietf.org/ipr.html."
RFC 2532-1999 history
1999RFC 2532-1999 Extended Facsimile Using Internet Mail