Johannes Schindelin [off-list ref] writes:
Of course, I am okay with it, but I consider the From: issue a real bug in
send-email (or format-patch, if you want).
Format-patch is about recording the author of the patch on From: line
(think of it a tool to reproduce an e-mail that you would have received
and applied to your tree). It may probably make a lot of sense to teach
send-email not to forge From: (even though, RFC is Ok with it, as long as
it also correctly adds Sender: pointing at the real sender).