[Mutt] #3090: Mutt removes In-Reply-To header field

[Mutt <fleas@xxxxxxxx>]

#3090: Mutt removes In-Reply-To header field

 On replying to a message, which Message-ID contains >1 "@" signs, the In-
 Reply-To field is first set correct (when editing the message) but after
 saving the message, the In-Reply-To field is set empty.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3090>