An updated internet-draft is available from the IETF. This draft is a work item of the Enhancements to Internet email to support diverse service environments Working Group of the IETF.
Abstract: «This document is a history capturing the background, motivation and thinking during the LEMONADE definition and design process. »
«The LEMONADE Working Group — Internet Messaging to support diverse service environments — is chartered to provide enhancements to Internet mail to facilitate its use by more diverse clients. In particular, by clients on hosts not only operating in environments with high latency/bandwidth-limited unreliable links but also constrained to limited resources. The enhanced mail must be backwards compatible with existing Internet mail.»