GNU bug report logs - #81368
rmail issue when rmail-display-summary is non-nil

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Package: emacs; Reported by: David Ponce <da_vid@HIDDEN>; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Wed, 08 Jul 2026 18:54:40 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: "Paul D. Nelson" <ultrono@HIDDEN>
In-Reply-To: <m2cxwxtrfn.fsf@HIDDEN> (ultrono@HIDDEN)
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
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> From: "Paul D. Nelson" <ultrono@HIDDEN>
> Cc: da_vid@HIDDEN, 81368-done <at> debbugs.gnu.org
> Date: Wed, 08 Jul 2026 17:46:36 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> >> From: "Paul D. Nelson" <ultrono@HIDDEN>
> >> Cc: da_vid@HIDDEN, 81368 <at> debbugs.gnu.org
> >> Date: Tue, 07 Jul 2026 19:16:45 +0200
> >> 
> >> > Paul, could you please explain why this solves the problem?  I don't
> >> > think I understand that.
> >> 
> >> M-x rmail first visits the Rmail file via find-file-noselect.  With the
> >> newly added auto-mode-alist entry, that visit can run rmail-mode
> >> immediately, before rmail has finished its own setup.
> >> 
> >> This call to rmail-mode is redundant, and typically harmless, but when
> >> rmail-display-summary is enabled, rmail-mode calls rmail-summary, which
> >> makes the summary buffer the current buffer.  When find-file-noselect
> >> returns, rmail continues its setup in the wrong buffer, yielding the
> >> mayhem observed in the report.
> >> 
> >> By binding auto-mode-alist to nil around the call to find-file-noselect,
> >> we avoid the unnecessary call to rmail-mode in rmail.
> >
> > Ah, so this is to prevent recursive invocation of 'rmail' from
> > 'rmail'?  Very well, installed with a suitable comment, and closing
> > the bug.
> >
> > Thanks.
> 
> Thanks likewise.  I've attached a follow-up patch clarifying the
> comment.  The issue is not recursive invocation: neither 'rmail' nor
> 'rmail-mode' calls the other.  Rather, 'rmail' does its own setup after
> visiting the file, and that setup is disturbed if the file visit
> activates 'rmail-mode' via 'auto-mode-alist'.

Thanks, installed.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

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From: "Paul D. Nelson" <ultrono@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
In-Reply-To: <86zf0162bl.fsf@HIDDEN> (message from Eli Zaretskii on Wed, 08
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 Content preview: Eli Zaretskii writes: >> From: "Paul D. Nelson" >> Cc:
 da_vid@HIDDEN, 
 81368 <at> debbugs.gnu.org >> Date: Tue, 07 Jul 2026 19:16:45 +0200 >> >> > Paul,
 could you please explain why this solves the problem? I don't >> > thi [...]
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--=-=-=
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

>> From: "Paul D. Nelson" <ultrono@HIDDEN>
>> Cc: da_vid@HIDDEN, 81368 <at> debbugs.gnu.org
>> Date: Tue, 07 Jul 2026 19:16:45 +0200
>> 
>> > Paul, could you please explain why this solves the problem?  I don't
>> > think I understand that.
>> 
>> M-x rmail first visits the Rmail file via find-file-noselect.  With the
>> newly added auto-mode-alist entry, that visit can run rmail-mode
>> immediately, before rmail has finished its own setup.
>> 
>> This call to rmail-mode is redundant, and typically harmless, but when
>> rmail-display-summary is enabled, rmail-mode calls rmail-summary, which
>> makes the summary buffer the current buffer.  When find-file-noselect
>> returns, rmail continues its setup in the wrong buffer, yielding the
>> mayhem observed in the report.
>> 
>> By binding auto-mode-alist to nil around the call to find-file-noselect,
>> we avoid the unnecessary call to rmail-mode in rmail.
>
> Ah, so this is to prevent recursive invocation of 'rmail' from
> 'rmail'?  Very well, installed with a suitable comment, and closing
> the bug.
>
> Thanks.

Thanks likewise.  I've attached a follow-up patch clarifying the
comment.  The issue is not recursive invocation: neither 'rmail' nor
'rmail-mode' calls the other.  Rather, 'rmail' does its own setup after
visiting the file, and that setup is disturbed if the file visit
activates 'rmail-mode' via 'auto-mode-alist'.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-lisp-mail-rmail.el-rmail-Clarify-comment-bug-81368.patch

From adefdec60ad7193371ef3d0ef35dadc1b7891b0f Mon Sep 17 00:00:00 2001
From: Paul Nelson <ultrono@HIDDEN>
Date: Wed, 8 Jul 2026 15:57:05 +0200
Subject: [PATCH] ; * lisp/mail/rmail.el (rmail): Clarify comment (bug#81368).

---
 lisp/mail/rmail.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index fcc6a8b89e2..f7770b047b9 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -903,8 +903,8 @@ rmail
       ;; The mail file is either unchanged or not visited.  Visit it.
       (switch-to-buffer
        (let ((enable-local-variables nil)
-             ;; Prevent recursive invocation of 'rmail' via
-             ;; 'auto-mode-alist'.
+             ;; Avoid entering 'rmail-mode' via 'auto-mode-alist';
+             ;; 'rmail' does its own setup after visiting the file.
 	     (auto-mode-alist nil)
 	     ;; Force no-conversion by default, since that's what
 	     ;; pre-mbox Rmail did with BABYL files (via
-- 
2.54.0


--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

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Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
To: Eli Zaretskii <eliz@HIDDEN>, "Paul D. Nelson" <ultrono@HIDDEN>
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Le 2026-07-08 à 15:25, Eli Zaretskii a écrit :
>> From: "Paul D. Nelson" <ultrono@HIDDEN>
>> Cc: da_vid@HIDDEN, 81368 <at> debbugs.gnu.org
>> Date: Tue, 07 Jul 2026 19:16:45 +0200
>>
>>> Paul, could you please explain why this solves the problem?  I don't
>>> think I understand that.
>>
>> M-x rmail first visits the Rmail file via find-file-noselect.  With the
>> newly added auto-mode-alist entry, that visit can run rmail-mode
>> immediately, before rmail has finished its own setup.
>>
>> This call to rmail-mode is redundant, and typically harmless, but when
>> rmail-display-summary is enabled, rmail-mode calls rmail-summary, which
>> makes the summary buffer the current buffer.  When find-file-noselect
>> returns, rmail continues its setup in the wrong buffer, yielding the
>> mayhem observed in the report.
>>
>> By binding auto-mode-alist to nil around the call to find-file-noselect,
>> we avoid the unnecessary call to rmail-mode in rmail.
> 
> Ah, so this is to prevent recursive invocation of 'rmail' from
> 'rmail'?  Very well, installed with a suitable comment, and closing
> the bug.
> 
> Thanks.

Thank you both.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at 81368-done <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: "Paul D. Nelson" <ultrono@HIDDEN>
In-Reply-To: <uxsg7th5masosi.fsf@HIDDEN> (ultrono@HIDDEN)
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
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> From: "Paul D. Nelson" <ultrono@HIDDEN>
> Cc: da_vid@HIDDEN, 81368 <at> debbugs.gnu.org
> Date: Tue, 07 Jul 2026 19:16:45 +0200
> 
> > Paul, could you please explain why this solves the problem?  I don't
> > think I understand that.
> 
> M-x rmail first visits the Rmail file via find-file-noselect.  With the
> newly added auto-mode-alist entry, that visit can run rmail-mode
> immediately, before rmail has finished its own setup.
> 
> This call to rmail-mode is redundant, and typically harmless, but when
> rmail-display-summary is enabled, rmail-mode calls rmail-summary, which
> makes the summary buffer the current buffer.  When find-file-noselect
> returns, rmail continues its setup in the wrong buffer, yielding the
> mayhem observed in the report.
> 
> By binding auto-mode-alist to nil around the call to find-file-noselect,
> we avoid the unnecessary call to rmail-mode in rmail.

Ah, so this is to prevent recursive invocation of 'rmail' from
'rmail'?  Very well, installed with a suitable comment, and closing
the bug.

Thanks.
Notification sent to David Ponce <da_vid@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 81368 <at> debbugs.gnu.org:


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From: "Paul D. Nelson" <ultrono@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
In-Reply-To: <86pl0z6pax.fsf@HIDDEN> (message from Eli Zaretskii on Tue, 07
 Jul 2026 13:56:38 +0300)
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> Paul, could you please explain why this solves the problem?  I don't
> think I understand that.

M-x rmail first visits the Rmail file via find-file-noselect.  With the
newly added auto-mode-alist entry, that visit can run rmail-mode
immediately, before rmail has finished its own setup.

This call to rmail-mode is redundant, and typically harmless, but when
rmail-display-summary is enabled, rmail-mode calls rmail-summary, which
makes the summary buffer the current buffer.  When find-file-noselect
returns, rmail continues its setup in the wrong buffer, yielding the
mayhem observed in the report.

By binding auto-mode-alist to nil around the call to find-file-noselect,
we avoid the unnecessary call to rmail-mode in rmail.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at 81368 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: David Ponce <da_vid@HIDDEN>
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Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
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> Date: Mon, 6 Jul 2026 20:45:11 +0200
> Cc: 81368 <at> debbugs.gnu.org
> From: David Ponce <da_vid@HIDDEN>
> 
> Le 2026-07-06 à 17:41, Paul D. Nelson a écrit :
> > Eli Zaretskii <eliz@HIDDEN> writes:
> > 
> >>> Date: Mon, 6 Jul 2026 13:10:36 +0200
> >>> From: David Ponce via "Bug reports for GNU Emacs,
> >>>   the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> >>>
> >>> Hello,
> >>>
> >>> Since this commit:
> >>>
> >>> author	Paul Nelson <ultrono@HIDDEN>	
> >>> 	Sun, 21 Jun 2026 18:19:26 +0200 (18:19 +0200)
> >>> commit	35af392aee538254f92fb2386f1dd69c7d0fb82b
> >>> Keep Rmail collection buffers unibyte
> >>>
> >>>
> >>> When `rmail-display-summary' is non-nil, the `rmail' command fails to
> >>> get new messages and creates an unexpected "RMAIL-summary-summary"
> >>> buffer in addition to the expected "RMAIL-summary" and "RMAIL"
> >>> buffers.  All these buffers are empty.
> >>>
> >>> My recipe:
> >>>
> >>> I checked that I have new messages in my /var/spool mailbox.
> >>>
> >>> In emacs -Q, I eval (setopt rmail-display-summary t)
> >>> then type M-x rmail
> >>>
> >>> When `rmail-display-summary' is nil, or if `rmail-display-summary' is
> >>> non-nil AND the new `rmail-mode' entry is `auto-mode-alist' is
> >>> removed, `M-x rmail' works as expected and displays both the
> >>> "RMAIL-summary" and "RMAIL" buffers with the new messages.
> >>>
> >>> It seems there is a nasty side-effect of `rmail-mode' automatic setup,
> >>> and rmail-summary, but I did not find the root cause.
> >>
> >> I cannot reproduce this.  I tried
> >>
> >>    C-u M-x rmail RET mail.new RET
> >>
> >> after setting rmail-display-summary non-nil in "emacs -Q", and the
> >> summary buffer has a reasonable name.  Maybe there are other factors
> >> at work here?
> >>
> >> Paul, could you please look into this?
> > 
> > I believe the attached patch fixes David's issue.
> > 
> 
> Hi Paul,
> 
> I confirm that your patch fixed my issue.

Thanks for testing.

Paul, could you please explain why this solves the problem?  I don't
think I understand that.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at 81368 <at> debbugs.gnu.org:


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Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
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Le 2026-07-06 à 17:41, Paul D. Nelson a écrit :
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
>>> Date: Mon, 6 Jul 2026 13:10:36 +0200
>>> From: David Ponce via "Bug reports for GNU Emacs,
>>>   the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>>
>>> Hello,
>>>
>>> Since this commit:
>>>
>>> author	Paul Nelson <ultrono@HIDDEN>	
>>> 	Sun, 21 Jun 2026 18:19:26 +0200 (18:19 +0200)
>>> commit	35af392aee538254f92fb2386f1dd69c7d0fb82b
>>> Keep Rmail collection buffers unibyte
>>>
>>>
>>> When `rmail-display-summary' is non-nil, the `rmail' command fails to
>>> get new messages and creates an unexpected "RMAIL-summary-summary"
>>> buffer in addition to the expected "RMAIL-summary" and "RMAIL"
>>> buffers.  All these buffers are empty.
>>>
>>> My recipe:
>>>
>>> I checked that I have new messages in my /var/spool mailbox.
>>>
>>> In emacs -Q, I eval (setopt rmail-display-summary t)
>>> then type M-x rmail
>>>
>>> When `rmail-display-summary' is nil, or if `rmail-display-summary' is
>>> non-nil AND the new `rmail-mode' entry is `auto-mode-alist' is
>>> removed, `M-x rmail' works as expected and displays both the
>>> "RMAIL-summary" and "RMAIL" buffers with the new messages.
>>>
>>> It seems there is a nasty side-effect of `rmail-mode' automatic setup,
>>> and rmail-summary, but I did not find the root cause.
>>
>> I cannot reproduce this.  I tried
>>
>>    C-u M-x rmail RET mail.new RET
>>
>> after setting rmail-display-summary non-nil in "emacs -Q", and the
>> summary buffer has a reasonable name.  Maybe there are other factors
>> at work here?
>>
>> Paul, could you please look into this?
> 
> I believe the attached patch fixes David's issue.
> 

Hi Paul,

I confirm that your patch fixed my issue.

Thanks
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at 81368 <at> debbugs.gnu.org:


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From: "Paul D. Nelson" <ultrono@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
In-Reply-To: <8633xw8g2w.fsf@HIDDEN> (message from Eli Zaretskii on Mon, 06
 Jul 2026 15:20:39 +0300)
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--=-=-=
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Mon, 6 Jul 2026 13:10:36 +0200
>> From: David Ponce via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>> 
>> Hello,
>> 
>> Since this commit:
>> 
>> author	Paul Nelson <ultrono@HIDDEN>	
>> 	Sun, 21 Jun 2026 18:19:26 +0200 (18:19 +0200)
>> commit	35af392aee538254f92fb2386f1dd69c7d0fb82b
>> Keep Rmail collection buffers unibyte
>> 
>> 
>> When `rmail-display-summary' is non-nil, the `rmail' command fails to
>> get new messages and creates an unexpected "RMAIL-summary-summary"
>> buffer in addition to the expected "RMAIL-summary" and "RMAIL"
>> buffers.  All these buffers are empty.
>> 
>> My recipe:
>> 
>> I checked that I have new messages in my /var/spool mailbox.
>> 
>> In emacs -Q, I eval (setopt rmail-display-summary t)
>> then type M-x rmail
>> 
>> When `rmail-display-summary' is nil, or if `rmail-display-summary' is
>> non-nil AND the new `rmail-mode' entry is `auto-mode-alist' is
>> removed, `M-x rmail' works as expected and displays both the
>> "RMAIL-summary" and "RMAIL" buffers with the new messages.
>> 
>> It seems there is a nasty side-effect of `rmail-mode' automatic setup,
>> and rmail-summary, but I did not find the root cause.
>
> I cannot reproduce this.  I tried
>
>   C-u M-x rmail RET mail.new RET
>
> after setting rmail-display-summary non-nil in "emacs -Q", and the
> summary buffer has a reasonable name.  Maybe there are other factors
> at work here?
>
> Paul, could you please look into this?

I believe the attached patch fixes David's issue.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Disable-auto-mode-alist-during-M-x-rmail.patch

From 3c26a878c1ae3e934e735ba88cfb6ca55c99158c Mon Sep 17 00:00:00 2001
From: Paul Nelson <ultrono@HIDDEN>
Date: Mon, 6 Jul 2026 17:25:17 +0200
Subject: [PATCH] Disable 'auto-mode-alist' during M-x rmail

* lisp/mail/rmail.el (rmail): Bind 'auto-mode-alist' to nil
while visiting the Rmail file, so that filename-based major mode
selection does not interfere.  (Bug#81368)
---
 lisp/mail/rmail.el | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 9f495ddf0f8..123c16d0e04 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -903,6 +903,7 @@ rmail
       ;; The mail file is either unchanged or not visited.  Visit it.
       (switch-to-buffer
        (let ((enable-local-variables nil)
+	     (auto-mode-alist nil)
 	     ;; Force no-conversion by default, since that's what
 	     ;; pre-mbox Rmail did with BABYL files (via
 	     ;; auto-coding-regexp-alist).
-- 
2.54.0


--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at 81368 <at> debbugs.gnu.org:


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To: David Ponce <da_vid@HIDDEN>, Paul Nelson <ultrono@HIDDEN>
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 (bug-gnu-emacs@HIDDEN)
Subject: Re: bug#81368: rmail issue when rmail-display-summary is non-nil
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> Date: Mon, 6 Jul 2026 13:10:36 +0200
> From: David Ponce via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> Hello,
> 
> Since this commit:
> 
> author	Paul Nelson <ultrono@HIDDEN>	
> 	Sun, 21 Jun 2026 18:19:26 +0200 (18:19 +0200)
> commit	35af392aee538254f92fb2386f1dd69c7d0fb82b
> Keep Rmail collection buffers unibyte
> 
> 
> When `rmail-display-summary' is non-nil, the `rmail' command fails to
> get new messages and creates an unexpected "RMAIL-summary-summary"
> buffer in addition to the expected "RMAIL-summary" and "RMAIL"
> buffers.  All these buffers are empty.
> 
> My recipe:
> 
> I checked that I have new messages in my /var/spool mailbox.
> 
> In emacs -Q, I eval (setopt rmail-display-summary t)
> then type M-x rmail
> 
> When `rmail-display-summary' is nil, or if `rmail-display-summary' is
> non-nil AND the new `rmail-mode' entry is `auto-mode-alist' is
> removed, `M-x rmail' works as expected and displays both the
> "RMAIL-summary" and "RMAIL" buffers with the new messages.
> 
> It seems there is a nasty side-effect of `rmail-mode' automatic setup,
> and rmail-summary, but I did not find the root cause.

I cannot reproduce this.  I tried

  C-u M-x rmail RET mail.new RET

after setting rmail-display-summary non-nil in "emacs -Q", and the
summary buffer has a reasonable name.  Maybe there are other factors
at work here?

Paul, could you please look into this?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Hello,

Since this commit:

author	Paul Nelson <ultrono@HIDDEN>	
	Sun, 21 Jun 2026 18:19:26 +0200 (18:19 +0200)
commit	35af392aee538254f92fb2386f1dd69c7d0fb82b
Keep Rmail collection buffers unibyte


When `rmail-display-summary' is non-nil, the `rmail' command fails to
get new messages and creates an unexpected "RMAIL-summary-summary"
buffer in addition to the expected "RMAIL-summary" and "RMAIL"
buffers.  All these buffers are empty.

My recipe:

I checked that I have new messages in my /var/spool mailbox.

In emacs -Q, I eval (setopt rmail-display-summary t)
then type M-x rmail

When `rmail-display-summary' is nil, or if `rmail-display-summary' is
non-nil AND the new `rmail-mode' entry is `auto-mode-alist' is
removed, `M-x rmail' works as expected and displays both the
"RMAIL-summary" and "RMAIL" buffers with the new messages.

It seems there is a nasty side-effect of `rmail-mode' automatic setup,
and rmail-summary, but I did not find the root cause.

Thanks

In GNU Emacs 32.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
   3.24.52, cairo version 1.18.4) of 2026-07-06
Repository revision: b31954283556a8e9fdc0081e83deb3cdcfe992cb
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101023
System Description: Fedora Linux 44 (KDE Plasma Desktop Edition)

Configured using:
   'configure -q --with-native-compilation=no
   --with-tree-sitter=no --with-x --with-x-toolkit=gtk3 --with-cairo
   --without-xft --with-harfbuzz --with-gnutls --with-gsettings
   --with-modules --with-threads --with-libgmp --with-xml2 --with-zlib
   --with-file-notification=inotify --without-libotf --without-xim
   --without-gpm
Acknowledgement sent to David Ponce <da_vid@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#81368; Package emacs. Full text available.
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