draft-lemonade-imap-submit-01.txt. “Forward without Download” Allow IMAP client to include previously-received message (or parts) in or as new message without downloading and then uploading the content
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Proxy authentication can be solved by having IMAP authenticate to Submit as an admin user (perhaps with TLS client certs), or if the client permits, by IMAP sending client's credentials to Submit.
Require Submit to support SASL authorization IDs.
Require support for MAIL FROM ... AUTH=...
Support for authorization ID allows IMAP server to send msgs from itself and to send msgs on behalf of a user, and for these cases to be distinguished. Can use SASL external if Submit server trusts IMAP server (perhaps by IP address).
Submit server needs to support a subset of IMAP FETCH.
IMAP server needs to support per-user mailbox secrets.
Case of forward with annotation without download and store result in sent mail requires IMAP server to supply email address that causes new mail to be deposited into a folder (generally useful in itself), or client can use COMPOSE to assemble message in outbox, then submit completed message. This latter approach also solves future delivery with revocation as message can be deleted (or modified) prior to being sent. As bonus, queued message counts against user’s quota.
Security issues with authorization token (eavesdropper can access message, during validity of token, but only if submission uses unprotected channel, hence no worse than current submission over unprotected channel).