Re: Problems with a mailbox in Rmail format

[Eli Zaretskii]

> From: Pascal Quesseveur <pquessev@gmail.com>
> Date: Fri, 25 Aug 2017 15:12:13 +0200
> 
> I have saved some messages from Gnus to a mailbox in Rmail
> format. When I open the file in rmail-mode messages are not displayed
> as expected: they are displayed in full, no headers are removed, MIME
> parts are not handled, ... It seems to me problems come from the fact
> mail headers in the mailbox are capitalized and rmail-mode search and
> match operatinos are case dependant. I have set an advice around
> (rmail-show-message-1) to set case-fold-search to t and problems
> disapeared.
> 
> I am wondering if the problem can come from my configuration or if it
> is an error in my version of Emacs (checked with Emacs 24.3.1 and
> 24.5.1.).

case-fold-search is t by default.  Did you change the default?

Which operation in rmail-show-message-1 depends on letter-case of the
headers?  In general, Rmail uses mail-fetch-field to get the headers,
and tha function explicitly binds case-fold-search to t.