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The following list is the Character Set codes for most of the available Character Sets, grouped by language or region. It is recommended that when using Character Set codes in a filter that extreme caution be used, and use only the Character Sets absolutely needed to block unwanted mail.

When including the Character Sets in a policy, do not include the “charset=” portion, as this is left in only for reference.

--ARABIC--
ASMO 708 charset=ASMO-708
DOS charset=DOS-720
ISO charset=iso-8859-6
Mac charset=x-mac-arabic
Windows charset=windows-1256
IBM EBCDIC charset=x-EBCDIC-Arabic

--BALTIC--
DOS charset=ibm775
ISO charset=iso-8859-4
Windows charset=windows-1257

--CENTRAL EUROPEAN--
DOS charset=ibm852
ISO charset=iso-8859-2
Mac charset=x-mac-ce
Windows charset=windows-1250
IBM EBCDIC charset=x-EBCDIC-DenmarkNorway
IBM EBCDIC charset=x-ebcdic-denmarknorway-euro
IBM EBCDIC charset=x-EBCDIC-FinlandSweden
IBM EBCDIC charset=x-ebcdic-finlandsweden-euro
IBM EBCDIC charset=x-ebcdic-france-euro
IBM EBCDIC charset=X-EBCDIC-Spain
IBM EBCDIC charset=x-ebcdic-spain-euro

--CHINESE SIMPLIFIED--
EUC charset=EUC-CN
GB2312 charset=gb2312
HZ charset=hz-gb-2312
Mac charset=x-mac-chinesesimp
IBM EBCDIC charset=x-EBCDIC-SimplifiedChinese
Government Standard charset=GB18030

--CHINESE TRADITIONAL--
Big5 charset=big5
CNS charset=x-Chinese-CNS
Eten charset=x-Chinese-Eten
Mac charset=x-mac-chinesetrad
IBM EBCDIC charset=x-EBCDIC-TraditionalChinese

--CYRILLIC RUSSIAN, ETC.--
DOS charset=cp866
ISO charset=iso-8859-5
KOI8-R charset=koi8-r
KOI8-U charset=koi8-u
Mac charset=x-mac-cyrillic
Windows charset=windows-1251
IBM EBCDIC Russian charset=x-EBCDIC-CyrillicRussian
IBM EB… Serbian-Bulgarian charset=x-EBCDIC-CyrillicSerbianBulgarian

--EUROPA--
Europa charset=x-Europa

--GERMAN--
IA5 charset=x-IA5-German
IBM EBCDIC charset=x-EBCDIC-Germany
IBM EBCDIC charset=x-ebcdic-germany-euro

--GREEK--
Greek DOS charset=ibm737
Greek ISO charset=iso-8859-7
Greek Mac charset=x-mac-greek
Windows charset=windows-1253
DOS charset=ibm869
IBM EBCDIC charset=x-EBCDIC-GreekModern
IBM EBCDIC charset=x-EBCDIC-Greek

--HEBREW--
DOS charset=DOS-862
ISO-Logical charset=iso-8859-8-i
ISO-Visual charset=iso-8859-8
Mac charset=x-mac-hebrew
Windows charset=windows-1255
IBM EBCDIC charset=x-EBCDIC-Hebrew

--ICELANDIC—
DOS charset=ibm861
Mac charset=x-mac-icelandic
IBM EBCDIC charset=x-EBCDIC-Icelandic
IBM EBCDIC charset=x-ebcdic-icelandic-euro

--INTERNATIONAL EUROPEAN
IBM EBCDIC charset=x-ebcdic-international-euro

--ITALIAN--
IBM EBCDIC charset=x-EBCDIC-Italy
IBM EBCDIC charset=x-ebcdic-italy-euro

--ISCII Languages—
Assamese charset=x-iscii-as
Bengali charset=x-iscii-be
Devanagari charset=x-iscii-de
Gujarathi charset=x-iscii-gu
Kannada charset=x-iscii-ka
Malayalam charset=x-iscii-ma
Oriya charset=x-iscii-or
Panjabi charset=x-iscii-pa
Tamil charset=x-iscii-ta
Telugu charset=x-iscii-te

--JAPANESE—
EUC charset=euc-jp
EUC charset=x-euc-jp
JIS charset=iso-2022-jp
JIS-Allow 1 byte Kana - SO/SI charset=iso-2022-jp
JIS-Allow 1 byte Kana charset=csISO2022JP
Mac charset=x-mac-japanese
Shift-JIS charset=shift_jis
IBM EBCDIC Kaakana charset=x-EBCDIC-JapaneseAndKana
IBM EBCDIC Japanese-Latin charset=x-EBCDIC-JapaneseAndJapaneseLatin
IBM EBCDIC US-Canada charset=x-EBCDIC-JapaneseAndUSCanada
IBM EBCDIC katakana charset=x-EBCDIC-JapaneseKatakana

--KOREAN—
Korean charset=ks_c_5601-1987
EUC charset=euc-kr
ISO charset=iso-2022-kr
Johab charset=Johab
Mac charset=x-mac-korean
IBM EBCDIC charset=x-EBCDIC-KoreanAndKoreanExtended
IBM EBCDIC charset=x-EBCDIC-KoreanExtended

--LATIN—
ISO charset=iso-8859-3
ISO charset=iso-8859-15
Multilingual Latin charset=CP870

--NORWEGIAN—
IA5 charset=x-IA5-Norwegian

--OEM UNITED STATES—
IBM OEM charset=IBM437

--SWEDISH—
IA5 charset=x-IA5-Swedish

--THAI—
Windows charset=windows-874
IBM EBCDIC charset=x-EBCDIC-Thai

--TURKISH—
DOS charset=ibm857
ISO charset=iso-8859-9
Mac charset=x-mac-turkish
Windows charset=windows-1254
Latin-5 charset=CP1026
IBM EBCDIC charset=x-EBCDIC-Turkish

--UNICODE—
Unicode charset=unicode
Unicode (Big-Endian) charset=unicodeFFFE
Unicode (UTF-7) charset=utf-7
Unicode (UTF-8) charset=utf-8

--US ASCII—
US-ASCII charset=us-ascii

--UNITED KINGDOM--
IBM EBCDIC charset=x-EBCDIC-UK
IBM EBCDIC charset=x-ebcdic-uk-euro

--US/CANADA--
IBM EBCDIC charset=ebcdic-cp-us
IBM EBCDIC –Euro charset=x-ebcdic-cp-us-euro

--VIATNAMESE—
Windows charset=windows-1258

--WESTERN EUROPEAN—
DOS charset=ibm850
IA5 charset=x-IA5
ISO charset=iso-8859-1
Mac charset=macintosh
Windows charset=Windows-1252

For more information on character sets, please see the links below:

http://en.wikipedia.org/wiki/Category:Character_sets
http://en.wikipedia.org/wiki/Character_encoding
http://mcaf.ee/x9s0h
http://a4esl.org/c/charset.html