What Is SMTP? The Mail Protocol That Sends Your Email, Explained

• 28 June 2026
• by: Ravi Subramanian
• in: Email services
• Tags: email protocol, SMTP, smtp protocol
• note: no comments

What is SMTP? A precise explainer of the Simple Mail Transfer Protocol: how it sends and relays email, the SMTP conversation, authentication, and SMTP vs IMAP/POP3.

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