Thanks for the reply. I thought the spam filtering out was most likely yahoo’s fault. I honestly don’t think any of my problems are related to bbpress, and maybe more likely my cheapo hosting!
I have another installation of bbpress on another domain and it seems to work ok.
I’m thinking of looking into linking up with wordpress as well because I have used it before and really like it. Any my forum seems to be functioning which is the main thing and I’m happy I found bbpress for it!