You want to configure the new (from 16.1) Mail Service functionality that we can find in:
Classic PPM >> Administration >> General Settings >> Mail Service (Beta)
There are a few fields in there for Incoming Server, Mail Account, OAuth Configuration and want to know how to configure those.
What details are needed to complete this configuration?
Release : 16.1.0
You would need to supply your own POP3 or IMAP service details.
Authentication can be "Basic (user/password)" or "Oauth" if their mail service allows for that.
This Documentation on Email Service has a detailed explanation:
You can show the configuration screen to you email service administrator.
The Oauth section is not needed if using Basic authentication.