A lot of projects use the Email Connector module https://marketplace.mendix.com/link/component/120739
It contains a lot of functionality, which makes it difficult to understand and use. Moreover, lot of projects just need to be able to send an email, but without importing or templates.
My suggestion is to split this module into distinct functionalities: 1. connector (only), 2. importing mails(boxes), 3. templates. 2 and 3 rely on 1, but not v.v. Only the latter one needs model reflection, the others don't. Keeps the model much cleaner and easier to understand.