These apps send and receive emails from email servers that require OAuth 2.0 authentication, such as Gmail, for example.
It improves upon the functionality of the Mail receive element available in Switch Designer, but there are some differences (see the documentation below).
An eLearning to learn how to setup these apps is available for all users with an active Switch maintenance contract. The eLearning can be viewed here
Would like that oAuth 2.0 was implemented as an option in Switch preferences instead.
Works as it should.