What is SMTP (Simple Mail Transfer Protocol)? 

SMTP makes sending email messages easy. Watch to learn what SMTP is and how it works.
Simple Mail Transfer Protocol, or SMTP for short, is a TCP/IP protocol used for sending emails. It's limited in its ability to receive messages, so it's typically used in conjunction with other protocols in order to receive emails.
SMTP is a three step process: an email server uses SMTP to send a message from an email client, such as Outlook, to an email server. The server then uses SMTP as a relay service to send the message to the receiving email server. Finally, the receiving server downloads the message using an email client, such as IMAP. SMTP is the most widely used email protocol, however, cloud-based HTTP APIs have become more common in recent years.
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