Sebastian Fischmeister <sfischme@uwaterloo.ca> writes:

> Hi,
>
> After upgrading to notmuch 0.22, my emacs config seems broken:
>
> (setq message-default-mail-headers "Reply-to: me@example.com\nBcc: me@example.com")
>
> When creating a new mail, it has no header other than "To:" and
> "Subject:".
>
> Since I cannot find any item in the NEWS related to this release, is
> this expected behaviour?

Looks like this problem was introduced in commit 570c0aeb40bd.
Confusingly it looks like it has something to do with the different
handling of "message-default-headers" and "message-default-mail-headers"
in message-setup-1.

d