[Akismet](http://akismet.com/) provides a very good spam filter. Integrate it with kottapalli comments. Look at sample code in [openlibrary repo](http://github.com/openlibrary/openlibrary/blob/9c2c15b214c83f0a51dc41ff91d3840aa511438f/openlibrary/plugins/akismet/code.py).
Akismet provides a very good spam filter. Integrate it with kottapalli comments.
Look at sample code in openlibrary repo.