Fix the email system and intercommunication project.

I would like to devise a new email system for my business. We currently only have two main business emails that manage a series of requests. Making it difficult for us to manage the flow of information and the interconnected flow of requests. We are a small, family hotel (more accurately a lodge) and I'd like to arrange an email system (with the possibility of segmenting it how you see fit) that makes it clear and easy for our employees to use. I have devised an internal system of communication but we still have yet to control the flow of information coming into our business.