Support charset "ks_c_5601-1987"

I would love to do that. Could you send me an example message?

I use the iconv library to do conversions. Apparently it should support all of the above:

iconv --list | egrep -i 'ks_c_5601-1987|EUC-KR|CP949'
ISO-IR-149 KOREAN KSC_5601 KS_C_5601-1987 KS_C_5601-1989 CSKSC56011987
EUC-KR EUCKR CSEUCKR
CP949 UHC

It'll be easier to debug with an example. I've also seen issues with some Japanese messages (which required workarounds).

I'm attaching a part of a raw message. Also, refer to the attachment file current.png and correct.png. If you look carefully, you'll notice that the English characters are shown correctly, while the Korean characters are shown incorrectly.

Subject: =?ks_c_5601-1987?B?yKS9wyBSQU0gtbXC+Mffs6q/5D8=?=
Date: Mon, 17 Apr 2006 18:11:37 +0900
Message-ID: <001d01c661fe$ee4080f0$6501a8c0@clare>
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="----=_NextPart_000_001E_01C6624A.5E2828F0"
X-Mailer: Microsoft Office Outlook 11
Thread-Index: AcZh/u3c6Rx/z+HCS/qEI0rmxG33qQ==
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869

This is a multi-part message in MIME format.

------=_NextPart_000_001E_01C6624A.5E2828F0
Content-Type: text/plain;
    charset="ks_c_5601-1987"
Content-Transfer-Encoding: base64

wfazrSDB1r+hIFNEU8P4v6G8rSBSQU0gwda5rsfPvMy02bDtIMfPtMK1pSwNCg0KwaawoSDFw7no
ILHiu+e60LKyIL+stvTAuyC53sH2ILj4x9+z17/kLg0KDQogDQoNCsikvcMgsPy4rsDavce/oSBS
QU0gtbXC+MfftMLB9iC+y7DtIMDWwLi46SC/rLb0wda8vL/kLg0KDQqxzcHfx7DAzrWlILrQvcfH
38C7se4gsMbBpLXHvK1eXg0KDQo=

------=_NextPart_000_001E_01C6624A.5E2828F0
Content-Type: text/html;
    charset="ks_c_5601-1987"
Content-Transfer-Encoding: quoted-printable

<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns=3D"http://www.w3.org/TR/REC-html40">

<head>
<meta http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dks_c_5601-1987">
<meta name=3DGenerator content=3D"Microsoft Word 11 (filtered medium)">
<style>
<!--
 /* Font Definitions */
 @font-face
    {font-family:=B9=D9=C5=C1;
    panose-1:2 3 6 0 0 1 1 1 1 1;}
@font-face
    {font-family:=B1=BC=B8=B2;
    panose-1:2 11 6 0 0 1 1 1 1 1;}
@font-face
    {font-family:"\@=B1=BC=B8=B2";
    panose-1:2 11 6 0 0 1 1 1 1 1;}
@font-face
    {font-family:"\@=B9=D9=C5=C1";
    panose-1:2 3 6 0 0 1 1 1 1 1;}
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
    {margin:0cm;
    margin-bottom:.0001pt;
    text-align:justify;
    text-justify:inter-ideograph;
    text-autospace:none;
    word-break:break-hangul;
    font-size:10.0pt;
    font-family:=B9=D9=C5=C1;}
a:link, span.MsoHyperlink
    {color:blue;
    text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
    {color:purple;
    text-decoration:underline;}
span.EmailStyle17
    {mso-style-type:personal-compose;
    font-family:=B1=BC=B8=B2;
    color:windowtext;}
 /* Page Definitions */
 @page Section1
    {size:595.3pt 841.9pt;
    margin:99.25pt 3.0cm 3.0cm 3.0cm;
    layout-grid:18.0pt;}
div.Section1
    {page:Section1;}
-->
</style>

</head>

<body lang=3DKO link=3Dblue vlink=3Dpurple>

<div class=3DSection1 style=3D'layout-grid:18.0pt'>

<p class=3DMsoNormal><font size=3D2 face=3D=B1=BC=B8=B2><span =
style=3D'font-size:10.0pt;
font-family:=B1=BC=B8=B2'>=C1=F6=B3=AD =C1=D6=BF=A1 <span =
lang=3DEN-US>SDS</span>=C3=F8=BF=A1=BC=AD <span lang=3DEN-US>RAM =
</span>=C1=D6=B9=AE=C7=CF=BC=CC=B4=D9=B0=ED
=C7=CF=B4=C2=B5=A5<span =
lang=3DEN-US>,<o:p></o:p></span></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D=B1=BC=B8=B2><span =
style=3D'font-size:10.0pt;
font-family:=B1=BC=B8=B2'>=C1=A6=B0=A1 =C5=C3=B9=E8 =
=B1=E2=BB=E7=BA=D0=B2=B2 =BF=AC=B6=F4=C0=BB =B9=DE=C1=F6 =
=B8=F8=C7=DF=B3=D7=BF=E4<span =
lang=3DEN-US>.<o:p></o:p></span></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D=B1=BC=B8=B2><span =
lang=3DEN-US style=3D'font-size:10.0pt;
font-family:=B1=BC=B8=B2'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D=B1=BC=B8=B2><span =
style=3D'font-size:10.0pt;
font-family:=B1=BC=B8=B2'>=C8=A4=BD=C3 =B0=FC=B8=AE=C0=DA=BD=C7=BF=A1 =
<span lang=3DEN-US>RAM </span>=B5=B5=C2=F8=C7=DF=B4=C2=C1=F6 =
=BE=CB=B0=ED =C0=D6=C0=B8=B8=E9 =BF=AC=B6=F4=C1=D6=BC=BC=BF=E4<span
lang=3DEN-US>.<o:p></o:p></span></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D=B1=BC=B8=B2><span =
style=3D'font-size:10.0pt;
font-family:=B1=BC=B8=B2'>=B1=CD=C1=DF=C7=B0=C0=CE=B5=A5 =
=BA=D0=BD=C7=C7=DF=C0=BB=B1=EE =B0=C6=C1=A4=B5=C7=BC=AD<span =
lang=3DEN-US>^^<o:p></o:p></span></span></font></p>

</div>

</body>

</html>

------=_NextPart_000_001E_01C6624A.5E2828F0--

I can see that the body of mail is properly converted, but the subject and the sender name isn't.
Perhaps you could try to convert the subject and the sender name as well?

You missed the note I believe:

Note: Messages already fetched by MailMate unfortunately needs to be re-fetched using “Message ▸ Reset...”.

Did you try this?

You are right. I did miss the note and indeed it works now. Thank you.