[Mailman-i18n] Emails with a Subject in Chinese to a Mailing List ????

I am currently using Mailman 2.1.5 provided by a hosting service. When I send emails with a subject in Chinese to a mailing list that I created in Mailman, the emails are always discarded without any notice to the senders and recipients. Would anyone please help me to solve this issue? I will appreciate any information on this issue Thanks. --------------------------------- Start your day with Yahoo! - make it your home page