Due to an oversight, one of the header filters has potentially modified
the message body, leading to broken cryptographic signatures.
Switch to the Message-Id instead of the Content-Type header, which is
usually only present in the global header.
Signed-off-by: Moritz Poldrack <git@moritz.sh>
Co-Authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>
Reported-by: Cole Young <cole@young.sh>
Fixes: 009237cc ("chore: Prevent Microsoft MUAs from sending reactions (#4120)")
Moritz Poldrack
Georg Lauterbach