This is a bit off-topic but you never know, someone might have an answer...
How do you fix spam if you get most of your email on a Blackberry first, before you login to your PC?
The guy who is asking me this has a domain email account, like fred@example.com.
He gets his email direct from the domain registrar, not through a website. The domain registrar doesn't seem to have any anti-spam protection.
I've no idea what OS a Blackberry runs so I can't comment on the client hardware / software end. I guess if it was me I'd get a small web hosting account for starters, that's about $8 a year, and you can filter some of it out straight away with cPanel (SpamAssassin etc).
Don't know if you can use the Cloudmark service on a mobile. Over 2 U