This version incorporates a lot of the recent feedback. Of particular
interest:
- a flow diagram in section 1 for clarification of definitions
- minor ABNF corrections
- clarifications around the authentication identifier
- rearrange and rework header addition/removal text
- some changes in the IANA Considerations section
- additional Security Considerations suggesting the ESMTP/IMAP solutions
- add a multi-tiered authentication example
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