If you send to Gmail users at any meaningful volume, Google Postmaster Tools is the closest thing to seeing your domain through Google's eyes.

After you verify your domain it shows your spam rate, authentication results, encryption and delivery errors. The catch is that data appears only once your daily volume to Gmail is high enough, so smaller senders often see empty charts.

uChecker's guide covers setting up Google Postmaster Tools and Yahoo Sender Hub and how to read the reports once data starts coming in.