No, power mailer will not tie into your existing user database.
the registration built into Power Messenger is based on security assist, and will not work with the Dreamweaver authentication system.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.