On Wed 12/Mar/2025 15:51:44 +0100 Allen Robinson wrote:
Definition of forwarding
In the context of DKIM2, this is the act of accepting a message with some
821.To address and resending it to some number of other 821.To addresses,
potentially after modifying the message. This definition covers most MTAs,
if I understand correctly. Needing to change the 821.From in this case is
certainly a large change for the ecosystem as a whole, but one that we feel
provides sufficient value to justify the cost.
SMTP describes this as "Mailing Lists".
I think an argument could be made that this definition doesn't apply to all
relays. Systems that don't need to change 821.From or 821.To and don't modify
the message being transferred would probably be able to operate without
attaching their own signatures.
AFAIUI, only backup MXes can forward a message without changing 821.To.
If signing 821.To could somehow be made into a separate signature, the
"classic" alias forwarding would not break the other (part of the) signature,
which would therefore be more compatible with DKIM1.
Best
Ale
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