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Why do you think you need a new protocol for this? Instead what you want is a different IMAP server.

• billpg 8y ago
  It has been a long time since I looked at IMAP. Are servers that do this now commonplace? (None I could find used to.) Can I know from a capability exchange if the remote server will send emails after adding to the "Outbox" folder?
  • amaccuish 8y ago
    No, not as far as I'm aware. But it's an idea I've also had. Upload the message to drafts, and then when you're ready to send, just move it to Outbox right?
    • billpg 8y ago
      That would be ideal. Keep SMTP as a server-to-server protocol only and IMAP as server-to-client.
• tjoff 8y ago
  And update all clients everywhere so that they are compatible with the new IMAP server.