321711 - Messages with empty Content-Type: header aren't correctly displayed

Status: RESOLVED DUPLICATE of bug 155537

(Thunderbird :: Mail Window Front End, defect)

Description

[Alexander Skwar]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8) Gecko/20051223 Firefox/1.5
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; de; rv:1.8) Gecko/20051223 Firefox/1.5

After I ran KMail, certain messages in my IMAP storage (like the one which I will attach) aren't displayed correctly anymore.

The reason for this is, that a blank Content-Type: header got added. Ie. the following got added:

Content-Type: 

No content.

This causes Thunderbird 1.0.6 to malfunction. Tb doesn't display the body anymore. And it shows an "attachment" of name "attachment".

I suppose that is so, because the Content-Type: header is invalid. But if that's the case, then Tb is violating RFC 2045:

   Default RFC 822 messages without a MIME Content-Type header are taken
   by this protocol to be plain text in the US-ASCII character set,
   which can be explicitly specified as:

     Content-type: text/plain; charset=us-ascii

   This default is assumed if no Content-Type header field is specified.
   It is also recommend that this default be assumed when a
   syntactically invalid Content-Type header field is encountered.


Note the recommendation in the last sentence. This means, that the message should be displayed as there was a value of "text/plain; charset=us-ascii".

Reproducible: Always

Steps to Reproduce:

Comment 1

[Alexander Skwar]

Attachment: Email which isn't displayed correctly.

Comment 2

[Alexander Skwar]

This bug is also present in SeaMonkey, according to <news:[e-mail]> -> http://groups.google.com/groups?threadm=[e-mail]

Comment 3

[Mike Cowperthwaite]

Yes, this is a Core bug: TB and Seamonkey.

*** This bug has been marked as a duplicate of 155537 ***