Multilingual ASP Webmail

My multilingual webmail often garbles non-english characters such as Japanese and Russian. However, sometimes it does not. I need someone to write me an ASP webmail program that will support all languages 100% of the time. It does not need to be a polished commercial product. I just need to see how to set the various elements like codepage, charset, the settings in the email server components, the settings in my IIS and in my database, etc. You must use an ASP page to submit to server. You must use both CDOSYS and JMail webmail components to send the mail. You must also save the text into a SQL Server database using stored procedures. These text must also not become garbled, because the recipient may view the email via the same ASP website. It is ok to send HTML mail. It is ok to ask the sender to choose a language when composing. (But much better if you can accomplish without it.) It is ok to ask the email recipient to adjust the character encoding when viewing. I need to learn what is the trick to making it work 100% of the time.