1<Button onPress={() => Linking.openURL('mailto:support@example.com') }
2      title="support@example.com" />
3        
4        
5With subject and body:
6
7<Button onPress={() => Linking.openURL('mailto:support@example.com?subject=SendMail&body=Description') }
8      title="support@example.com" />

1openMailApp() {
2    if (Platform.OS === 'android') {
3      NativeModules.UIMailLauncher.launchMailApp(); // UIMailLauncher is the 
4      return;
5    }
6    Linking.openURL('message:0'); // iOS
7    return;
8  }