GMail in Your Language http://gmail.google.com/support/bin/answer.py?answer=6569&query=language&topic=&type=f

Can I send or read email in other languages?

Answer :

Although the Gmail interface is written in US English, Gmail users can send and receive messages in a variety of languages.
Right now it is only possible to search in English. All information in the 'Settings' section of your account, including your name, labels and filters must also be in English.

If you are having trouble sending or receiving messages in a language other than English, there may be two problems:

Some users have experienced problems with the following languages and encodings:
Simplified Chinese (HZ & GBK)
Cyrillic/Ukrainian (KOI8-U)
Vietnamese (TCVN)
Hebrew (ISO-8859-8-I)
Nordic (ISO-8859-10)
Armenia (ARMSCII-8)
Thai (windows-874)

Messages sent to or from other email providers may be encoded in a format that causes the text of a message to be unreadable. Gmail uses UTF-8 encoding for all messages. If you are unable to send or receive messages in languages other than English, we suggest adjusting your browser's encoding settings.

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