The Mail Extensions Working Group will review, refine as needed, and then make a recommendation on standardization of several recent proposals for standards-track compatible extensions to SMTP (via the Service Extensions mechanism), MIME (via new Content Subtypes), and MIME-MHS (via MIME Content Subtypes and usage rules). It will also act as the review body for several documents that clarify and provide applicability statements about the use of Internet mail: that work will ultimately lead to an update for the mail-related section of RFC 1123. Part of that effort involves RARE WG-MSG documents that address the Internet's installed electronic mail infrastructure. Since such documents should not be processed in RARE alone, this working group will act as the IETF focus for reviewing them. Initial drafts of all of the documents that the working group is expected to review have already been, or will soon be, published. The working group will be starting with documents that have been prepared as individual (or spontaneous design team) contributions. It is not expected to initiate new work. On the other hand, it is expected to make explicit ``not ready for standardization'' or ``inappropriate for standardization'' recommendations if that is appropriate. The working group will be initialized with the following Internet- Drafts or their successors, listed alphabetically. A major purpose of its first meeting is to prune or add to this list. draft-freed-ftbp-00.txt draft-freed-smtp-pipeline-00.txt draft-houttuin-mailservers-02.txt draft-rare-msg-a-bombs-00.txt draft-rare-msg-c-bombs-00.txt draft-vaudreuil-smtp-binary-04.txt draft-vaudreuil-smtp-stream-00.txt