On Tue, 13 Nov 2018 22:37,
bartbutler=40protonmail(_dot_)com(_at_)dmarc(_dot_)ietf(_dot_)org
said:
"The key MUST carry a User ID packet ([RFC4880]) containing the email address
to which mail sent to the queried email address will be routed."
You are talking about how mail is routed, the spec is about discovering
the one and only key to be used for a given mail address. And by key I
mean the OpenPGP keyblock, that is the public key plus one user ID (or
several if they have the same addrspec part).
A mail address is here considered as an identifier for an entity and not
as an addressing scheme for mails. An entity may have several
identifiers like Werner.Koch@foo, Werner_Koch@foo, wernerkoch@foo,
wk@foo, koch@foo. That is a pretty normal but there is no way a sender
can decide whether they are all the same; for example the last two of
the list could also identify my brother.
A sender gets hold of one mail address and that must have been relayed
(direct or indirectly) to them by the owner of that mail address. The
recipient needs to take care that a key exists for that very mail
address.
Sub-addresses are different and we can find a way to handle this common
case.
Salam-Shalom,
Werner
--
Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.
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