[Tickets #12969] Messages are not built properly when replying from a mobile client using activesync and are not readable when using accents

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Ticket URL: http://bugs.horde.org/ticket/12969
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  Ticket             | 12969
  Created By         | software-horde at interfasys.ch
  Summary            | Messages are not built properly when replying from a
                     | mobile client using activesync and are not readable
                     | when using accents
  Queue              | Horde Framework Packages
  Version            | Git master
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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software-horde at interfasys.ch (2014-02-11 18:56) wrote:

When replying from a BlackBerry 10 device, the message is not properly  
"built" before being sent and there seems to be a mix of encoding  
which makes the message unreadable if using a lot of accentuated  
characters.

This is a recent problem which may have been introduced in ActiveSync  
2.12.4. This was tested on the Webmail edition version 5.1.3 with all  
the modules updated 15 minutes ago.

Steps to reproduce:
1) Send an email from Outlook 12 or Thunderbird 24.
The message will display fine on all mail clients.
2) Reply from a BlackBerry 10 device, but that shouldn't matter if  
that's an AES problem. The original message is quoted in the message.
Result:
The message will not be readable in any client, except IMP.
The quoted message is not readable in IMP (and is broken in two if you  
have your preference set to "reply at the bottom" in ActiveSync prefs)

Differences I've noticed
Original message
Content-Type: text/plain; charset=UTF-8

Reply
Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes

The reply seems to be built by Horde:
User-Agent: Horde Application Framework 5

I'm keeping this report public and the original message and the reply  
will be sent privately.