On Wed 26/Mar/2025 17:31:54 +0100 Wei Chuang wrote:
On Wed, Mar 26, 2025 at 9:08 AM Alessandro Vesely <ves...@tana.it> wrote:
Hmm... Delivered-To: doesn't seem to be a significant element. [...]
It's meant to be illustrative of some header updates during forwarding
where someone e.g. a mailing list may care to sign for an extra header.
(We wouldn't)
It should be the envelop from, no? I don't think mf= or equivalent can be
avoided, unless we slightly push the use of Author: (RFC 9057).
To recap, the use of rt=, as you illustrated, is optional. If it is specified,
the message was not intended for any of the To:/Cc: recipients, so it is a
Bcc:, so it must be single-valued. If it is not specified, it makes no
difference whether the message was intended for one or more To:/Cc: recipients.
Best
Ale
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