Character set conversion and message reformatting

One very basic mapping table in the MTA is the character set conversion  table. The name of this table is. It is used to specify what sorts of channel-to-channel character set  conversions and message reformattings should be performed.

On many systems there is no need to do character set conversions or message reformatting and therefore this table is not needed. Situations arise, however, where character conversions must be done. For example, sites with enclaves of local users accustomed to using older charsets such as ISO-2022-JP (for Japanese) or KOI8-R (for Russian) may wish to convert messages outbound to the Internet into the general UTF-8 charset, to increase interoperability with remote Internet correspondents.

See also:
 * CHARSET-CONVERSION mapping table
 * Message reformatting
 * Relabelling MIME header lines
 * Service conversions
 * Mapping tables
 * Message conversions
 * Converting ISO-2022-JP to UTF-8 and back