flexi auth - A user authentication library for CodeIgniter

[eluser]haseydesign[/eluser]
@estevo

I can't say I've heard of anyone trying to run flexi auth on SuPHP.

The flexi auth library only uses the native CodeIgniter email library, it doesn't do anything particularly tricky.
Therefore, I would check that you can use CI's email library within a standalone demo run on the same server.