I am right that the current N900 email client doesn't support a rules based system to filter emails into a folder?

Currently the mail client is nearly unusable for me (I typically get over 500 spam emails a day). So I'd like to search email headers for the spam filter scoring that my mail server puts in and move them into a junk folder.

Is the source code for the "in box" mail client available so I can hack a regex and move bit of code in? Or should I just give up and use a different email client? (Edit: Claws looks like it might do the job if gets ported to fremantle)

Suggestions?

Peter