To articulate my needs a little bit better, I'd like the service to be able to verify phone numbers and/or e-mail addresses. The service would be white labeled

To articulate my needs a little bit better, I'd like the service to be able to verify phone numbers and/or e-mail addresses. The service would be white labeled such that, to the user, it would look like a normal registration form and login specific to my app with a custom confirmation e-mail. The confirmation e-mail part is probably the biggest headache of all and something I'd like to offload. We don't want to use FBConnect or Google accounts for branding purposes. Any suggestions are appreciated. :-)