[imp] Subject line encoding problem

[Otto Stolz]

Hello,

Daniel A. Ramaley wrote:
> our webmail server [...] runs Horde 3.1.5 and Imp 4.1.5
...
> i sent a message 3 times, each time selecting a different 
> encoding. In both the Subject and the body i typed "日本語"
...
> With Horde/Imp:
>
> Encoding      Subject line
> -----------   ----------------------------------
...
> ISO-2022-JP   =?UNKNOWN?Q?=1B$BF|K=5C8l=1B=28B?=
...
> But the Subject line for ISO-2022-JP does not display correctly when 
> the message is received. I'm not sure what encoding Imp put it in, and 
> from its own use of "UNKNOWN" it looks like Imp wasn't so sure either.

«=1B$BF|K=5C8l=1B=28B» is «日本語» in ISO-2022-JP/quoted-printable,
whilst «GyRCRnxLXDhsGyhC»« is the same string in ISO-2022-JP/base-64,
cf. infra.

So, Imp has used the desired encoding, but has not tagged it
correctly.

Best wishes,
   Otto Stolz

------------- Test case --------------------
I have sent the following message to myself, and both subject
and message-text displayed correctly as «日本語»:

Subject: =?iso-2022-jp?b?GyRCRnxLXDhsGyhC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-2022-jp
Content-Transfer-Encoding: quoted-printable

=1B$BF|K=5C8l=1B=28B
-------------End of test case --------------------