| Characters set group | Character set language code | Header and body encoding |
| Arabic | Windows-1256, ISO-8859-6 | Base64, Quoted Printable, None |
| Baltic Rim | Windows-1257 | Quoted Printable, Base64, None |
| Central Europe | ISO-8859-2, Windows-1250 | Quoted Printable, Base64, None |
| Cyrillic | KO18-R, ISO-8859-5, Windows-1251 | Base64, Quoted Printable, None |
| English | US-ASCII | None, Base64, Quoted Printable , None |
| Greek | Windows-1253, ISO-8859-7 | Base64, Quoted Printable, None |
| Hebrew | Windows-1255, ISO-8859-8, ISO-8859-8-I | Base64, Quoted Printable, None |
| Japanese | ISO-2022-JP | Header - Base64, Quoted Printable, None
Body - None, Base64, Quoted Printable, None |
| Korean | Header - EUC-KR, ISO-2022-KR
Body - ISO-2022-KR, EUC-KR | Header - Base64, Quoted Printable, None
Body - None, Base64, Quoted Printable, None |
| Simplified Chinese | GB2312, GB18030, HZ-GB2312 | Base64, Quoted Printable, None |
| Thai | TIS-620 | Base64, Quoted Printable, None |
| Traditional Chinese | Big5, EUC-TW | Base64, Quoted Printable, None |
| Turkish | Windows-1254, ISO-8859-9 | Quoted Printable, Base64, None |
| Unicode | UTF-8, UTF-7 | Base64, Quoted Printable, None |
| Vietnamese | Windows-1258, TCVN3 | Quoted Printable, Base64, None |
| Western | ISO-8859-1, ISO-8859-15, Windows-1252 | Quoted Printable, Base64, None |