(keitai-l) web form, aspmail, japanese and ezweb encoding

I have a client for whom we built a few mobile sites, with versions for
docomo, au and vodafone.
Each site has a number of contact/registration forms that are being
processed with aspmail.
The sent mail is being viewed by the client with MS Outlook. The docomo and
vodafone email
is working fine, however approx. 50% of the time Japanese in mail from AU
handsets is coming
in scrambled as all questionmarks. This includes the name and message field.
I have tried a number of encoding options in the ASP using CustomCharSet,
but none seem to remedy the problem.

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Solid Thinking Interactive (STi Japan)
Lead Designer/Art Director
Kris　Honeycutt
Tel: 090-2787-4710
Fax: 0877-28-8079
kris.honeycutt_at_solid-thinking.com
www.solid-thinking.com