Definition: Simple Mail Transfer Protocol, or SMTP, is used to send email. The SMTP protocol provides a common language for different servers to send and receive email messages. The default TCP/IP port for the SMTP protocol is port 25.
Also Known As: Simple Mail Transfer Protocol
Editor-in-Chief at TechSpective
I have a passion for technology and gadgets and a desire to help others understand how technology can affect or improve their lives. I also love spending time with my wife, 7 kids, 4 dogs, 5 cats, a pot-bellied pig, and sulcata tortoise, and I like to think I enjoy reading and golf even though I never find time for either. You can contact me directly at tony@xpective.net. For more from me, you can follow me on Threads, Facebook, Instagram and LinkedIn.
Latest posts by Tony Bradley (see all)
- Rethinking Cybersecurity For A World Of AI And Machine Identities - March 10, 2026
- Who Do You Trust Online—And Why? - February 19, 2026
- EC-Council Launches New AI Certifications To Close The Skills Gap - February 10, 2026
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