Mail Server App Backend

This is the back end of an email server application

Frontend repo:

Email Server Frontend

Objective:

Implementing the basic functionalities of a mail server in the remote server of MongoDB, including sending manipulation of emails, and attachments.
Applying the learned design patterns.
To be more familiar with Spring Boot and MongoDB.

Technologies and tools used:

MongoDB as the document database model.
Spring Boot to get connection from and to the front end.
Heroku to host our back end on a remote server.