- 🇩🇪Germany Grevil
We just ran into the same issue, but I don't think this is a commerce_paypal issue there are / will be other modules that require a "proper" email validation. IMO Drupal should add a setting to allow emails without a top level domain.
For the time being, you can use https://www.drupal.org/project/evac → . Eventually this module could get recommended by commerce_paypal for the time being. What do you think @jsacksick?