If have a maildir file with a maildir format email in it.

I want to "bounce" it (using mutt's terminology) to another address.  By
"bounce", I mean have it sent verbatim (with zero changes and zero new
headers) to another email address.  Only the envelope-to will be new
(obviously).

I need to be able to see the email exactly as the original user would have
seen it, not "attached" or wrapped up in new headers.

All from the command line, preferably the actual cmd line, not a TUI like
mutt.

Mutt can do this with the "b" Bounce command, but I can't figure out a way
for mutt to get this single maildir format email imported via the -f
option (which needs an mbox).  I don't want to kludge/fudge it into mbox.

I tried s-nail and sendmail -i piping but both seem to take the input to
mean "body" instead of "headers+body"... though maybe I'm missing
something with the sendmail invocation?

If mutt can do it... surely I can do it from the command line!?  Probably
a magical sendmail option I'm not aware of...
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