Efficient Mail Submission & Delivery (EMSD) [1] is designed to provide SMTP-over-TCP functionality with reduced overhead via EMSD-over-UDP. Reliability is achieved using the Efficient Short Remote Operations Services 3-way handshake protocol. In this study, we compare the overhead incurred by using EMSD as compared to other Email protocols, and demonstrate EMSD's efficiency advantage. We use a Sniffer to capture the actual packets sent and received from a User Agent (UA), and count the number of bytes in the IP layer and above. These provide a reasonable figure when the UA is sending/receiving messages over an airlink.
This article was originally published in October 1996. It is being included in the Manifesto, essentially unchanged from its original form.