bug#22754: 25.1.50; Rmail does not follow RFC 2822

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Marcin Borkowski]

Dear Devs,

Rmail inserts lower-case field names in the header, which goes against
RFC 2822 (pp. 22 and 23, see
https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
affects Cc: and In-reply-to: fields.  Below is a simple patch which
seems to help.

Best,
mbork

--8<---------------cut here---------------start------------->8---
diff -u --label /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el --label \#\<buffer\ rmail.el\> /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el /tmp/buffer-content-1903Vxh
--- /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el
+++ #<buffer rmail.el>
@@ -3699,8 +3699,8 @@
 	;; point and mark (see doc of sc-cite-original).
 	(setq yank-action
 	      `(rmail-yank-current-message ,replybuffer)))
-    (push (cons "cc" cc) other-headers)
-    (push (cons "in-reply-to" in-reply-to) other-headers)
+    (push (cons "Cc" cc) other-headers)
+    (push (cons "In-reply-to" in-reply-to) other-headers)
     (setq other-headers
 	  (mapcar #'(lambda (elt)
 		      (cons (car elt) (if (stringp (cdr elt))

Diff finished.  Sun Feb 21 11:24:47 2016
--8<---------------cut here---------------end--------------->8---




In GNU Emacs 25.1.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.28)
 of 2016-02-10 built on jane
Repository revision: 4ccd2688911b90bcb8cdcd2a8de608e09471a91a
Windowing system distributor 'Fedora Project', version 11.0.11704000
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Recent messages:
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-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Andy Moreton]

On Sun 21 Feb 2016, Marcin Borkowski wrote:

> Dear Devs,
>
> Rmail inserts lower-case field names in the header, which goes against
> RFC 2822 (pp. 22 and 23, see
> https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
> affects Cc: and In-reply-to: fields.  Below is a simple patch which
> seems to help.
>
> Best,
> mbork
>
> diff -u --label /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el --label \#\<buffer\ rmail.el\> /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el /tmp/buffer-content-1903Vxh
> --- /home/mbork/ludzie-works/emacs/emacs/lisp/mail/rmail.el
> +++ #<buffer rmail.el>
> @@ -3699,8 +3699,8 @@
>  	;; point and mark (see doc of sc-cite-original).
>  	(setq yank-action
>  	      `(rmail-yank-current-message ,replybuffer)))
> -    (push (cons "cc" cc) other-headers)
> -    (push (cons "in-reply-to" in-reply-to) other-headers)
> +    (push (cons "Cc" cc) other-headers)
> +    (push (cons "In-reply-to" in-reply-to) other-headers)

This should be "In-Reply-To" as described in RFC 2822 section 3.6.4.

>      (setq other-headers
>  	  (mapcar #'(lambda (elt)
>  		      (cons (car elt) (if (stringp (cdr elt))
>
> Diff finished.  Sun Feb 21 11:24:47 2016

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Eli Zaretskii]

> From: Marcin Borkowski <mbork@mbork.pl>
> Date: Sun, 21 Feb 2016 11:28:27 +0100
> 
> Rmail inserts lower-case field names in the header, which goes against
> RFC 2822 (pp. 22 and 23, see
> https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
> affects Cc: and In-reply-to: fields.

I use Rmail all the time, and these headers are capitalized in my
reply messages.  So please provide a recipe starting from "emacs -Q",
there could be some other factor at work here.

Thanks.

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Glenn Morris]

Eli Zaretskii wrote:

>> From: Marcin Borkowski <mbork@mbork.pl>
>> Date: Sun, 21 Feb 2016 11:28:27 +0100
>> 
>> Rmail inserts lower-case field names in the header, which goes against
>> RFC 2822 (pp. 22 and 23, see
>> https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
>> affects Cc: and In-reply-to: fields.
>
> I use Rmail all the time, and these headers are capitalized in my
> reply messages.  So please provide a recipe starting from "emacs -Q",
> there could be some other factor at work here.

I assume it was a theoretical analysis...

With sendmail-user-agent, mail-setup inserts "Cc" and "In-reply-to"
directly (apparently the latter should be "In-Reply-To"?), ignoring the
case passed via other-headers.

With message-user-agent, message-mail explicitly uses capitalize on all
headers.

I suppose there's no guarantee that some other mail-user-agent won't use
the headers as supplied, but perhaps that would be a bug in the
user-agent?

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: Marcin Borkowski <mbork@mbork.pl>,  22754@debbugs.gnu.org
> Date: Mon, 22 Feb 2016 13:14:53 -0500
> 
> Eli Zaretskii wrote:
> 
> >> From: Marcin Borkowski <mbork@mbork.pl>
> >> Date: Sun, 21 Feb 2016 11:28:27 +0100
> >> 
> >> Rmail inserts lower-case field names in the header, which goes against
> >> RFC 2822 (pp. 22 and 23, see
> >> https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
> >> affects Cc: and In-reply-to: fields.
> >
> > I use Rmail all the time, and these headers are capitalized in my
> > reply messages.  So please provide a recipe starting from "emacs -Q",
> > there could be some other factor at work here.
> 
> I assume it was a theoretical analysis...
> 
> With sendmail-user-agent, mail-setup inserts "Cc" and "In-reply-to"
> directly (apparently the latter should be "In-Reply-To"?), ignoring the
> case passed via other-headers.
> 
> With message-user-agent, message-mail explicitly uses capitalize on all
> headers.

Yes, that's exactly what I saw.

> I suppose there's no guarantee that some other mail-user-agent won't use
> the headers as supplied, but perhaps that would be a bug in the
> user-agent?

If that's the problem, I think we can safely close this bug (perhaps
after fixing the "In-reply-to" letter-case).

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Marcin Borkowski]

On 2016-02-22, at 19:14, Glenn Morris <rgm@gnu.org> wrote:

> Eli Zaretskii wrote:
>
>>> From: Marcin Borkowski <mbork@mbork.pl>
>>> Date: Sun, 21 Feb 2016 11:28:27 +0100
>>> 
>>> Rmail inserts lower-case field names in the header, which goes against
>>> RFC 2822 (pp. 22 and 23, see
>>> https://tools.ietf.org/html/rfc2822#page-22).  It seems that the problem
>>> affects Cc: and In-reply-to: fields.
>>
>> I use Rmail all the time, and these headers are capitalized in my
>> reply messages.  So please provide a recipe starting from "emacs -Q",
>> there could be some other factor at work here.
>
> I assume it was a theoretical analysis...
>
> With sendmail-user-agent, mail-setup inserts "Cc" and "In-reply-to"
> directly (apparently the latter should be "In-Reply-To"?), ignoring the
> case passed via other-headers.
>
> With message-user-agent, message-mail explicitly uses capitalize on all
> headers.
>
> I suppose there's no guarantee that some other mail-user-agent won't use
> the headers as supplied, but perhaps that would be a bug in the
> user-agent?

Glenn, you mean what I did was theoretical analysis or what Eli did...?

For me, it was a real problem: I use mu4e as my email client, and it
didn't do the capitalization.  It is quite probable that it's mu4e's
bug, since indeed I could not reproduce it on emacs -Q (without mu4e).
It seems that your email saved me some analysis - you're right,
`message-mail' does the capitalization indeed.  When I have time
(probably Wednesday or Thursday), I'll propose a patch to the author of
mu4e.  For now, I'm closing this bug.

Nevertheless, I still think it is a bit sloppy: it looks like Emacs
depends on the incidental fact that all header field names are
capitalized, but AFAIU this is not a rule stated explicitly in RFC2822,
but just (it seems) a convention they have adopted.  IOW, in the
(unlikely of course - now /this/ is theoretical analysis!) case when
RFC2822 is superseded by another one, not adhering to this convention,
Emacs users will be in trouble, or, as a (not very elegant;-)) Polish
saying goes, "va qnex ohgg" (rot13'd since possibly NSFW). ;-)

Thanks and best regards

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Glenn Morris]

Marcin Borkowski wrote:

>>>> Rmail inserts lower-case field names in the header, which goes against
>>>> RFC 2822 (pp. 22 and 23, see
[...]
> For me, it was a real problem: I use mu4e as my email client, and it
> didn't do the capitalization. 

But mu4e does not use any rmail functions (it would be weird if it did).
So why did a mu4e problem make you think there was an issue with rmail.el?

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Marcin Borkowski]

On 2016-02-23, at 01:09, Glenn Morris <rgm@gnu.org> wrote:

> Marcin Borkowski wrote:
>
>>>>> Rmail inserts lower-case field names in the header, which goes against
>>>>> RFC 2822 (pp. 22 and 23, see
> [...]
>> For me, it was a real problem: I use mu4e as my email client, and it
>> didn't do the capitalization. 
>
> But mu4e does not use any rmail functions (it would be weird if it did).
> So why did a mu4e problem make you think there was an issue with rmail.el?

The other way round: rmail launches whatever `mail-user-agent' points
to, in my case it's `mu4e-user-agent'.

Best,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Glenn Morris]

Marcin Borkowski wrote:

> Rmail inserts lower-case field names in the header, which goes against
> RFC 2822 (pp. 22 and 23, see
> https://tools.ietf.org/html/rfc2822#page-22).

Andy Moreton wrote:

> This should be "In-Reply-To" as described in RFC 2822 section 3.6.4.


Going back to this, what exactly are you referring to in the RFC?
All I can find on the subject of case is an explicit statement that
values are case insensitive (as one would expect):

    1.2.2. Syntactic notation
    
    Characters will be specified either by a decimal value (e.g., the value
    %d65 for uppercase A and %d97 for lowercase A) or by a case-insensitive
    literal value enclosed in quotation marks (e.g., "A" for either
    uppercase or lowercase

So the fact they happen to write "In-Reply-To" implies nothing about case.

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Marcin Borkowski]

On 2016-02-26, at 18:43, Glenn Morris <rgm@gnu.org> wrote:

> Marcin Borkowski wrote:
>
>> Rmail inserts lower-case field names in the header, which goes against
>> RFC 2822 (pp. 22 and 23, see
>> https://tools.ietf.org/html/rfc2822#page-22).
>
> Andy Moreton wrote:
>
>> This should be "In-Reply-To" as described in RFC 2822 section 3.6.4.
>
> Going back to this, what exactly are you referring to in the RFC?
> All I can find on the subject of case is an explicit statement that
> values are case insensitive (as one would expect):

I've been told that if it is not stated explicitly that field names are
case-insensitive, they are not, and their names should nit be changed in
any way.

>     1.2.2. Syntactic notation
>     
>     Characters will be specified either by a decimal value (e.g., the value
>     %d65 for uppercase A and %d97 for lowercase A) or by a case-insensitive
>     literal value enclosed in quotation marks (e.g., "A" for either
>     uppercase or lowercase
>
> So the fact they happen to write "In-Reply-To" implies nothing about case.

Seems it does.

Best,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University

bug#22754: 25.1.50; Rmail does not follow RFC 2822

[Glenn Morris]

Marcin Borkowski wrote:

> I've been told that if it is not stated explicitly that field names are
> case-insensitive, they are not, and their names should nit be changed in
> any way.
>
>>     1.2.2. Syntactic notation
>>     
>>     Characters will be specified either by a decimal value (e.g., the value
>>     %d65 for uppercase A and %d97 for lowercase A) or by a case-insensitive
>>     literal value enclosed in quotation marks (e.g., "A" for either
>>     uppercase or lowercase


There's nothing in the RFC that supports what you were told.
Where it says anything, it says the opposite, as I cited.
The situation is the same in the later RFC 5322.
See also the more explicit RFC 5234:

  ABNF strings are case insensitive and the character set for these
  strings is US-ASCII.
  [...]
  To specify a rule that is case sensitive, specify the characters
  individually.

Any sane mail app should be prepared for "CC:", "Cc:", "cc:", or even
"cC:".