What Is SMTP? How the Email Sending Protocol Works

What Is SMTP? How the Email Sending Protocol Works

SMTP (Simple Mail Transfer Protocol) is the standard Internet protocol used to send email. When an email client, website, or application sends a message, SMTP handles its submission and transfer toward the recipient's mail server. SMTP is primarily associated with sending and relaying email, while IMAP and POP3 are used to access messages stored in a mailbox.
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Key Takeaways
SMTP stands for Simple Mail Transfer Protocol.
SMTP is used to submit and relay outgoing email.
Port 587 is commonly used for authenticated email submission with TLS.
Port 25 is primarily associated with server-to-server SMTP relay.
Port 465 is used for SMTP submission with implicit TLS.
Applications can also send email through an HTTP API instead of directly configuring SMTP

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