To make us your favorite on the Web/Desktop App...

  • Click on the small carrot in the lower left corner and then on Settings in the menu that appears. 

  • Click on the Preferences tab on the left side. Making Polymail your default app is the first option there:

 

To make us your favorite on iOS...

  • Go to Settings

  • Either scroll down the list of apps at the bottom, or

  • Pull down to reveal the search bar and type Polymail

  • Tap on Polymail in the list or the search results

  • Look for the setting Default Mail App

  • Tap Default Mail App

  • Once in the menu, select Polymail from the list