On Thu, 1 Jun 2017, A. Schulze wrote:


John Hardin:

any header that begins with "X-" is permitted.

permitted - yes

but I'm aware may user assisiate X- header still as private header.
This is no longer true since 2012: https://tools.ietf.org/html/rfc6648

just to mention that...
Andreas

Interesting. I wonder how that affects RFC-2822 (et. al.) headers, and specifically, the X-Spam-* headers that SA emits?

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 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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