http://www.rfc-editor.org/rfc/rfc4416.txt
RFC 4416: Goals for Internet Messaging to Support Diverse Service Environments, J. Wong2006-02-01T23:00:00-00:00The requirements for these devices drive a discussion of the possible protocol enhancements needed to support multimedia messaging on limited-capability hosts in diverse service environments. A list of general principles to guide the design of the enhanced messaging protocols is documented. Finally, additional issues of providing seamless service between enhanced Internet mail and the existing separate mobile messaging infrastructure are briefly listed. This memo provides information for the Internet community.