I use htmldump to render HTML mail to markdown, and then mutt's new multipart/alternative handling and this script to turn markdown back into HTML on sending, and this will also take care of forwarded emails to a suitable degree.
@martinkrafft | https://matrix.to/#/#madduck:madduck.net
"when a woman marries again it is because she detested her first husband.
when a man marries again it is because he adored his first wife.
women try their luck; men risk theirs."
-- oscar wilde
spamtraps: madduck.bogus@madduck.net