Simple Mail Transfer Protocol - Wikipedia
Name Protocols used for Email(IMAP, MIME, POP3, and SMTP)
What is POP3 (Post Office Protocol 3)?
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What are different Email protocols?
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How Email Actually Gets Sent: A Look At SMTP | by Aryaman Sharda | Medium
SMTP — It's History, Use and Meaning for Emails | Mailtrap Blog
Common Protocol - an overview | ScienceDirect Topics
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POP3 – Computer Networking Demystified
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SMTP - Simple Mail Transfer Protocol - javatpoint
![SMTP or IMAP: What's the Difference? [Bonus: What is POP3?]](https://www.socketlabs.com/wp-content/uploads/2019/05/SMTP-IMAP-1.png "SMTP or IMAP: What's the Difference? [Bonus: What is POP3?]")