What does SMTP in an SMTP server stand for? SMTP stands for Simple Mail Transfer Protocol. It is the standard communication protocol for sending email messages across the Internet. Whenever you click “Send” in your email client—whether it’s Gmail, Outlook, or a business email hosted on your own domain—SMTP is the technology that transfers your message from your device to the recipient... https://blog.oudel.com/what-does-the-smtp-in-an-smtp-server-stand-for-step-by-step-guide/