I am building a web application with email notification just like Facebook, which will host in http://www.linode.com/. When a user A comment to a post, the poster will get an email notification from '[email protected]' with the comment message written by user A. (Not spam)

I really like Google Apps but they have sending limits 2000 sending per day, that is not suit for my case becuz I cannot have sending limits. There will be many email notifications.

http://support.google.com/a/bin/answer.py?hl=en&answer=166852

I also need company email accounts for team members use which I prefer Google Apps.

My web application will host in linode, I am considering "Amazon Simple Notification Service" for the email notification.

My questions are

1. Any other recommend email service provider suits my case for me?
2. Can I bind company email accounts(ex: [email protected]) with Google Apps and bind [email protected] with other email service provider?