This plugin is awesome and I can't believe just now somebody is doing it.
Couple of things and a question.
1. I HAS to support encryption (gmail) does it?
2. There is no way to test the smtp server connection. There needs to be a way to make sure it's actually connecting.
3. Does this apply to all of your wp mailing connections? If not there should be an option to have your plugins setting work for all of the WP mailing. That way it would be useful also for newsletter plugins and the like.
Great stuff and a SUPER first release!!