no expert on ringtones.....but is the spam coming to your blackberry email address or a different email address?
If its the blackberry email address, you can log into the BIS website on cingular (http://www.cingular.com/blackberrystart
) and create filters on the site. If its from another email addie then maybe still create filters on the BIS website, but also see if you can up the spam protection within the email account on its own website (Yahoo, Hotmail, MSN, etc.).