JERAJournal of Electronic Research and Application2208-35022208-3510Bio-Byword Scientific Publishing Pty. Ltd.10.26689/jera.v8i4.7932ArticleA Design of an SMTP Email Serverhttps://artdesignp.com/journal/JERA/8/4/10.26689/jera.v8i4.7932HuLiheng2024842024-08-13This study developed a mail server program using Socket API and Python. The program uses the Hypertext Transfer Protocol (HTTP) to receive emails from browser clients and forward them to actual email service providers via the Simple Mail Transfer Protocol (SMTP). As a web server, it handles Transmission Control Protocol (TCP) connection requests from browsers, receives HTTP commands and email data, and temporarily stores the emails in a file. Simultaneously, as an SMTP client, the program establishes a TCP connection with the actual mail server, sends SMTP commands, and transmits the previously saved emails. In addition, we also analyzed security issues and the efficiency and availability of this server, providing insights into the design of SMTP mail servers.

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