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How Do We Fill the Gaps (continued) Payload compression Use IMAP Binary to avoid base64 expansion compression best handled at network layers Forward Without Download SMTP or IMAP APPEND “Outbox” with IMAP URL in MIME part: Content-type: Message/External-body, access-type=URL; URL=“IMAP: …” Streamlined Submission and Retrieval Proposal made in 3GPP2: X.P0016-311 MMS MM1 using M-IMAP Features: Manage submissions & retrievals over one connection to one server Basically IMAP with these enhancements: Pipelining (avoiding unnecessary transactions and RTT latencies) Brevity (omission of unneeded response text) DELIVER extension command (for submission & forwarding) |