This is a really good question. I recommend raising a Request for Information support ticket for this. The email module has platform support, so they should be able to tell you.
Did you raise a support ticket for this? Any updates from Mendix?
After examining the options for my project we came to the conclusion that we are going to use Microsoft Graph APIs to read mail from a mail box.
Perhaps this might also work for your project. Herewith a link to the Microsoft docs regarding retrieving messages: https://docs.microsoft.com/en-us/graph/api/resources/message?view=graph-rest-1.0.