Szymon Sokół <s...@b...operator.from.hell.pl> writes:

> On Sat, 5 Feb 2005 00:30:45 +0100, Andrzej P. Wozniak wrote:
>
>> Więc mógłby użyć zestawu chińskiego lub koreańskiego, prawda?
> Jeśli te zestawy zawierają US-ASCII jako podzbiór, to tak. Nie jest to dobrą
> praktyką, ale jest całkowicie legalne.

In general, mail-sending software must always use the "lowest
common denominator" character set possible. For example, if a body
contains only US-ASCII characters, it must be marked as being in
the US-ASCII character set, not ISO-8859-1, which, like all the
ISO-8859 family of character sets, is a superset of US-ASCII. More
generally, if a widely-used character set is a subset of another
character set, and a body contains only characters in the
widely-used subset, it must be labeled as being in that subset.

MJ