Electronic mail is a method of exchanging digital messages between computer users. Unlike instant messaging systems today's email systems are based on a store-and-forward model. Email servers accept, forward, deliver, and store messages. An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture.
At enlyft, we use sophisticated, patent-pending algorithms to track the use of various Email Communications Technologies products and technologies. We track 70 products in the Email Communications Technologies category, and have found 7,824,481 companies using these products.