Other message header fields, such as Importance [RFC2156], Priority
[RFC2156] and X-Priority, are used inconsistently and often with
different semantics from MT-Priority. Message Submission Agents
[RFC6409] MAY use such fields to assign an initial priority in the
absence of an SMTP PRIORITY parameter. Otherwise, such fields
MUST NOT be used for determining the priority under this "Priority
Message Handling" SMTP extension.
It seems you're complaining about other people doing something they never
wanted to do while actually making that error yourself.
I have no idea what you mean, so perhaps you can be more specific
about what it is that you want to do.
Barry
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