On Wed, 2023-05-24 18:29:31 +0200, Olaf Hering wrote:
> [..]
>
> Are the less-than and greater-than signs supposed to be part of the of the
> message id? In other words: is it supposed to be a "raw string", with just
> the surrounding blanks removed?
>
>From RFC 5322: “The message identifier (msg-id) syntax is a limited
version of the addr-spec construct enclosed in the
angle bracket characters, "<" and ">".”
That is, the less-than and greater-than signs _are_ part of the
message id and are required for standard compliance.
i.e., the OP's MUA is the culprit. The responding MUA had the choice
between breaking the thread or violating the standard.
Ludolf
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