SMTP Mail Service: The Backbone of Reliable Email Delivery
The Simple Mail Transfer Protocol (SMTP) stands as the cornerstone of email delivery across the internet. As an email protocol, SMTP is responsible for the sending and relaying of messages between email servers in the TCP/IP suite. Designed originally in the 1980s, SMTP governs the outgoing mail server infrastructure and serves as the standard method used by mail transfer agents (MTAs) such as Postfix, Sendmail, Exim, and Microsoft Exchange Server to forward email from a mail user agent (MUA) or an email client to the destination email server.