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Simon McVittie authored
We'll need this if we want to stamp optional header fields on the message according to the preferences of the recipient(s). Signed-off-by: Simon McVittie <smcv@collabora.com> Reviewed-by: Philip Withnall <withnall@endlessm.com> Bug: https://bugs.freedesktop.org/show_bug.cgi?id=101899
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