It's been suggested before. We used to offer a e-mail service called "Spam Shield". You could sign up for a Furtopia e-mail address that was VERY agressive on spam (it put mail in your regular mail box).
However we're waiting on a hardware upgrade that will be eventualy comming. As well as e-mail (reliable and long term like other Furtopia services) would require a dedicated staff to deal with abuse reports, throw away accounts, etc.
The idea has been tossed around and parhaps may be on the plate before too long. But right now we're focused on upgrading the core features (like adding artist watch, advanced search, etc).
WhiteShepherd