Abstract: Electronic mail system (EMS) is envisioned to work in a computer network for message forwarding, receipt and management. It is a sophisticated communication facility in office automation. A model of EMS running in the microcomputer network of NorthEastern Institute of Technology is briefly described. The system can send a message or pass on a coming message from one station to the mail box of another station. It can also send a broadcasting message to all mail boxes (stations) in the network. It also provides direct dialogue service via keyboards and screens between two stations. The structure of the system, mail service protocols, mode of messaging, allocation of mailboxes as well as personal security for authentication and access control measures are discussed in this paper.