bug#52871: 29.0.50; weird bug with Gnus, can't have "^From" in `message-hidden-header's

[Michael Heerdegen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Perhaps there's some other customisation option that also affects how
> this works?

Not that I knew.  I can reproduce the issue using the defaults of M-x
gnus-mock-start.

Did you actually try to send a message?  With Gnus Mock it's impossible
here to reply to any of the INBOX messages using that value of
`message-hidden-headers' and send successfully.

Michael.