From my local mail client, I am able to send messages in Chinese or Arabic and receive them correctly, so I know sendmail and dovecot are configured correctly.

When I send a message from the Squirrelmail interface, the messages appear as:

يسبنت سي...

We are using 1.4.8-4.0.1.el4.centos

Question is this...
 - where do I enable the ability to send unicode/UTF-8 messages?
 - where do I start in terms of figuring out where the problem is as?