You Asked: How do I set Google@CPS as my default email client?

To set Google@CPS as your default email client, follow these instructions from Google Help:

When you open email in Chrome, a message may appear at the top of the page asking if you'd like to allow Gmail to open all email links. If you click the Use Gmail button, Gmail's compose window will open the next time you click a hyperlinked email address on a page. Click No and your computer will continue to open email links the same way as before.