The guide still told users to "leave authserv_id unset" when their
server's host varies, which now drops every message that needs an
authenticated From:. State that the pin is required, how to find it
(the token before the first ';' of the topmost Authentication-Results
header your server writes), what to do when it seems to vary (RFC 8601
authserv-id names the administrative domain, so configure a stable one
and pin it), and that the only alternative is the explicit
require_authenticated_sender: false / EMAIL_TRUST_FROM_HEADER=true
opt-out. Mirror the reference tables, plugin.yaml prompt and zh-Hans
translation.
Co-authored-by: JiuYue0820 <287222957+FirmaSpring@users.noreply.github.com>
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