| Any party, anywhere along the transit path can implement DKIM
| signing. Its use is not confined to the end systems or only
| in a boundary MTA.
Found in 3.1.2, but chapter starts with "end-to-end", and this
is a critical point of the design. Please explain it, proposal:
[... as is ...]
| Signatures by intermediaries are also known as third party
| signatures.
If you add "email-arch" as reference maybe use the proper term
"mediators" instead of "intermediaries", or add "(mediators)".
Frank
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