[Tickets #13076] Re: mail with alternative part not correctly displayed

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Ticket URL: http://bugs.horde.org/ticket/13076
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  Ticket             | 13076
  Updated By         | Michael Slusarz <slusarz at horde.org>
  Summary            | mail with alternative part not correctly displayed
  Queue              | IMP
  Version            | 6.1.7
  Type               | Bug
-State              | Feedback
+State              | Not A Bug
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             | Michael Slusarz
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Michael Slusarz <slusarz at horde.org> (2014-04-01 01:05) wrote:

It's a broken message:

Content-Transfer-Encoding: utf8

This is an invalid encoding.  It's not parsed correctly by the IMAP  
server, for example:

C: 9 UID FETCH 60983 (BINARY.PEEK[1.2])
S: * 15 FETCH (UID 60983)
S: 9 NO [UNKNOWN-CTE] Unknown Content-Transfer-Encoding.
>> Command 9 took 0.0007 seconds.

Per RFC 2045:

    Any entity with an unrecognized Content-Transfer-Encoding must be
    treated as if it has a Content-Type of "application/octet-stream",
    regardless of what the Content-Type header field actually says.

Thus, we accurately indicate that there is no alternative part that  
can be displayed, since both alternatives have invalid CTEs and thus  
must be treated as application/octet-stream, which we are unable to  
display inline.