Your own client didn't
even generate valid References headers until I pointed it out.
my mail client doesn't generate References fields at all.
Had to dig through my archives. I meant In-Reply-To. See attached.
it generated valid in-reply-to fields as of the time the MUA was
written. and 2822 was intended to be compatible with 822, you know,
so 2822 readers should have been able to parse them.