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Subject: bug#13328: 24.2; Rmail does not properly decode MIME messages containing "From " lines or save such attachments correctly
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[|'s added to quote From lines]

    Run Rmail (emacs -q) on the following mbox file (remove |'s at line
start first):

|From mdl  Wed Oct 26 10:18:58 2011
|X-RMAIL-ATTRIBUTES: --EF----
|X-RMAIL-KEYWORDS: *
|X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED,
|	RP_MATCHES_RCVD autolearn=unavailable version=3.3.1
|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: <bug-gnu-emacs@HIDDEN>
|Subject: 23.3; rmail-edit-current-message adds extra '>'s to Froms...
|Date: Sat, 22 Oct 2011 12:05:57 -0700
|Reply-To: <mark.lillibridge@HIDDEN>
|
|
|Start with a Rmail message (this one will do) not containing MIME that
|contains lines like the following:
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|From mdl  Tue Jan  1 12:27:17 2013
|Delivered-To: lillibridge@HIDDEN
|Received: from gmail-pop.l.google.com [74.125.25.108]
|	by foil.strangled.net with POP3 (fetchmail-6.3.18)
|	for <mdl@localhost> (single-drop); Tue, 01 Jan 2013 12:27:17 -0800 (PST)
|Received: by 10.49.49.9 with SMTP id q9csp680843qen;
|        Tue, 1 Jan 2013 12:27:08 -0800 (PST)
|X-Received: by 10.52.69.201 with SMTP id g9mr59443696vdu.98.1357072028236;
|        Tue, 01 Jan 2013 12:27:08 -0800 (PST)
|Return-Path: <mark.lillibridge@HIDDEN>
|Received: from alum-mailsec-relay-12.mit.edu (ALUM-MAILSEC-RELAY-12.MIT.EDU. [18.7.68.32])
|        by mx.google.com with ESMTPS id o8si46143160vdv.77.2013.01.01.12.27.08
|        (version=TLSv1/SSLv3 cipher=OTHER);
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|	Tue, 1 Jan 2013 12:27:04 -0800
|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: mdl@HIDDEN
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge@HIDDEN
|Date: Tue, 01 Jan 2013 12:27:04 -0800
|Message-ID: <qmhip7gmyxz.fsf@HIDDEN>
|MIME-Version: 1.0
|Content-Type: text/plain
|Content-Disposition: attachment; filename=froms.txt
|X-RMAIL-ATTRIBUTES: ------U-
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|From mdl  Tue Jan  1 13:04:30 2013
|Delivered-To: lillibridge@HIDDEN
|Received: from gmail-pop.l.google.com [74.125.25.108]
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|	for <mdl@HIDDEN>; Tue, 1 Jan 2013 16:04:12 -0500
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|	Tue, 1 Jan 2013 13:04:08 -0800
|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: mdl@HIDDEN
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge@HIDDEN
|Date: Tue, 01 Jan 2013 13:04:07 -0800
|Message-ID: <qmhhan0mx88.fsf@HIDDEN>
|MIME-Version: 1.0
|Content-Type: multipart/mixed; boundary="=-=-="
|X-RMAIL-ATTRIBUTES: --------
|
|--=-=-=
|Content-Type: text/plain
|
|
|body part
|
|
|--=-=-=
|Content-Type: text/plain
|Content-Disposition: attachment; filename=froms.txt
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|--=-=-=--
|

    The result should be 3 messages, the first message (non-MIME) of
which looks like:

|X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED,
|	RP_MATCHES_RCVD autolearn=unavailable version=3.3.1
|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: <bug-gnu-emacs@HIDDEN>
|Subject: 23.3; rmail-edit-current-message adds extra '>'s to Froms...
|Date: Sat, 22 Oct 2011 12:05:57 -0700
|Reply-To: <mark.lillibridge@HIDDEN>
|
|
|Start with a Rmail message (this one will do) not containing MIME that
|contains lines like the following:
|
|From level 1
|>From level 2
|>>From level 3
|

This is properly decoded assuming mboxrd except for the extra blank line
at the end (bug #10080).  The second message, however, is incorrectly
decoded (toggle the show to see the froms.txt contents):

|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: mdl@HIDDEN
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge@HIDDEN
|Date: Tue, 01 Jan 2013 12:27:04 -0800
|Content-Type: text/plain
|Content-Disposition: attachment; filename=froms.txt
|
|
|[text/plain Hide Save:froms.txt (46B)]
|
|>From level 1
|>>From level 2
|>>>From level 3
|

The From lines should look identical to the first message.  The third
message demonstrates this problem with a non-in-line attachment:

|Authentication-Results: symauth.service.identifier
|From: Mark Lillibridge <mark.lillibridge@HIDDEN>
|To: mdl@HIDDEN
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge@HIDDEN
|Date: Tue, 01 Jan 2013 13:04:07 -0800
|Content-Type: multipart/mixed; boundary="=-=-="
|
|
|[1:text/plain Hide]
|
|
|body part
|
|
|[2:text/plain Hide Save:froms.txt (45B)]
|
|>From level 1
|>>From level 2
|>>>From level 3


    If I understand the resolution of bug 6574 correctly, it added a
variable for switching between mboxrd and mboxo (a broken but common
variant).  For reference, with mboxo all three sets of From lines should
read:

|From level 1
|>>From level 2
|>>>From level 3


    Saving one of the attachments gives incorrect results as well so
that functionality doesn't work correctly either:

froms.txt as saved:
|>From level 1
|>>From level 2
|>>>From level 3

- Mark

Message sent:

Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Mailer: MIME-tools 5.428 (Entity 5.428)
Content-Type: text/plain; charset=utf-8
X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: mdl@HIDDEN
Subject: bug#13328: Acknowledgement (24.2; Rmail does not properly decode
 MIME messages containing "From " lines or save such attachments correctly)
Message-ID: <handler.13328.B.13570761538007.ack <at> debbugs.gnu.org>
References: <8738ykvb8s.fsf@HIDDEN>
X-Gnu-PR-Message: ack 13328
X-Gnu-PR-Package: emacs
Reply-To: 13328 <at> debbugs.gnu.org
Date: Tue, 01 Jan 2013 21:36:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#13328: 24.2; Rmail does not properly decode MIME messages containing "From " lines or save such attachments correctly
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <8738ykvb8s.fsf@HIDDEN>
Date: Sun, 06 Dec 2020 20:30:08 +0100
In-Reply-To: <8738ykvb8s.fsf@HIDDEN> (Mark Lillibridge's message
 of "Tue, 01 Jan 2013 13:34:11 -0800")
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Mark Lillibridge <mdl@HIDDEN> writes:

> |>From level 1
> |>>From level 2
> |>>>From level 3
> |
>
> The From lines should look identical to the first message.

(This bug report unfortunately got no response at the time.)

Thanks for the easy recipe to reproduce this behaviour.

The issue is: In non-MIME messages, rmail strips one level of ">" from
all lines that start with ">+From ".  In MIME messages, it doesn't do
that.

I think the latter behaviour sounds correct, though.  It's common for
mailers to prepend a ">" to lines that start with "From " -- but usually
only when that actually matches an mbox delimiter, which "From level 1"
does not.

Furthermore, it's really uncommon for anything to prepend a ">" when the
line starts with ">From ".

So I think the bug here is that it does the stripping at all in these
cases.

Opinions?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#13328: 24.2; Rmail does not properly decode MIME messages containing "From " lines or save such attachments correctly
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87y2iapwan.fsf@HIDDEN> (message from Lars Ingebrigtsen on Sun, 
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Sun, 06 Dec 2020 20:30:08 +0100
> Cc: 13328 <at> debbugs.gnu.org
> 
> Furthermore, it's really uncommon for anything to prepend a ">" when the
> line starts with ">From ".
> 
> So I think the bug here is that it does the stripping at all in these
> cases.
> 
> Opinions?

If it doesn't strip, but keeps adding ">", these additions will
accumulate.  Therefore, I think that it can only stop stripping if it
also stops adding ">".  And that cannot be don, AFAIU, if we want to
be able to preserve the mbox format (for example, the FCC feature in
Rmail saves messages in mbox files).

Am I missing something?

Message sent to bug-gnu-emacs@HIDDEN:

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Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGPC/xhBQAAACBj
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 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: >> Furthermore, it's
 really uncommon for anything to prepend a ">" when the >> line starts with
 ">From ". >> >> So I think the bug here is that it does the stripping at
 all in these >> cases. >> >> Op [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Furthermore, it's really uncommon for anything to prepend a ">" when the
>> line starts with ">From ".
>> 
>> So I think the bug here is that it does the stripping at all in these
>> cases.
>> 
>> Opinions?
>
> If it doesn't strip, but keeps adding ">", these additions will
> accumulate.

No -- there's no accumulation.

Other mailers only add a ">" to the front of lines that match mbox
separators.  ">From" does not match any mbox separator, so there's no
accumulation.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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Subject: bug#13328: 24.2; Rmail does not properly decode MIME messages containing "From " lines or save such attachments correctly
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: mdl@HIDDEN,  13328 <at> debbugs.gnu.org
> Date: Mon, 07 Dec 2020 15:47:03 +0100
> 
> Other mailers only add a ">" to the front of lines that match mbox
> separators.  ">From" does not match any mbox separator, so there's no
> accumulation.

But Rmail uses "^From:?" as the regexp that identifies the beginning
of another message in an mbox file, so it must quote other "From"s to
avoid catastrophic failures later.  Or am I missing something?

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 Content preview: Eli Zaretskii <eliz@HIDDEN> writes: >> From: Lars
 Ingebrigtsen
 <larsi@HIDDEN> >> Cc: mdl@HIDDEN, 13328 <at> debbugs.gnu.org >> Date:
 Mon, 07 Dec 2020 15:47:03 +0100 >> >> Other mailers only add a ">" to the
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Lars Ingebrigtsen <larsi@HIDDEN>
>> Cc: mdl@HIDDEN,  13328 <at> debbugs.gnu.org
>> Date: Mon, 07 Dec 2020 15:47:03 +0100
>> 
>> Other mailers only add a ">" to the front of lines that match mbox
>> separators.  ">From" does not match any mbox separator, so there's no
>> accumulation.
>
> But Rmail uses "^From:?" as the regexp that identifies the beginning
> of another message in an mbox file, so it must quote other "From"s to
> avoid catastrophic failures later.  Or am I missing something?

If rmail uses that as the regexp, then I guess rmail will have to
continue quoting all "From:?" lines.  But that's a pretty odd regexp to
use to split an mbox file -- first of all, "^From:" is not an mbox
separator at all, and neither is "Fromage".

The normal way to split an mbox is to use something like
`message-unix-mail-delimiter'.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: mdl@HIDDEN,  13328 <at> debbugs.gnu.org
> Date: Tue, 08 Dec 2020 14:34:09 +0100
> 
> > But Rmail uses "^From:?" as the regexp that identifies the beginning
> > of another message in an mbox file, so it must quote other "From"s to
> > avoid catastrophic failures later.  Or am I missing something?
> 
> If rmail uses that as the regexp, then I guess rmail will have to
> continue quoting all "From:?" lines.  But that's a pretty odd regexp to
> use to split an mbox file -- first of all, "^From:" is not an mbox
> separator at all, and neither is "Fromage".

AFAIK, mbox format requires that every new message begins with a line
that starts with "From " (sorry, I forgot the space in my previous
message).  See, for example, this page:

  https://www.loc.gov/preservation/digital/formats/fdd/fdd000383.shtml

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 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: > AFAIK, mbox format
 requires that every new message begins with a line > that starts with "From
 " (sorry, I forgot the space in my previous > message). See, for example,
 this page: > > https://www.lo [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

> AFAIK, mbox format requires that every new message begins with a line
> that starts with "From " (sorry, I forgot the space in my previous
> message).  See, for example, this page:
>
>   https://www.loc.gov/preservation/digital/formats/fdd/fdd000383.shtml

The mbox format is more restrictive than just that.
`message-unix-mail-delimiter' is a regexp that matches these lines.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Last modified: Tue, 8 Dec 2020 16:30:01 UTC

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