Sparrow does not do push (yet). You can help us make it happen. See how here.

While Sparrow does not do push, you can do the following:
  • Install Boxcar,
  • Create your Boxcar account or sign in,
  • Add a service "Email Account",
  • In settings of the service "Email Account" on the iPhone application, choose "Opens", select "Sparrow".
  • Now, forward your emails to the email address provided by Boxcar.
If you are on Gmail, you'll receive a verification email with a code that you will find on the Boxcar iPhone application.