Simple Mail Transfer Protocol (SMTP) is the correct answer because it is the standard protocol used for sending emails from a client to a server. HTTP/S is primarily used for accessing web pages, POP3 and IMAP are used for retrieving emails from a server, but not for sending them.
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What does SMTP stand for, and how does it work?
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What are the roles of POP3 and IMAP in email communication?
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Can you explain the difference between HTTP/S and SMTP?