(keitai-l) How can I secure email via keitai?

Hi,

How can I secure email transmissions using a keitai? I know keitai's
can handle SSL transmissions on the mobile internet for site browsing,
but what about email?

I am working on a project that requires people to send in an email
with a photo attachment. I'd respondents to feel safe that their email
and attachment are securly sent to us.

Thanks!

Russel