SMTP (Simple Mail Transfer Protocol) is the protocol used to
send emails from email clients (like Outlook, Gmail) to mail servers and between mail servers over the Internet. It works at the
Application Layer of the OSI model.
How it works:
- The user sends an email through an application.
- SMTP establishes a connection with the mail server (usually on port 25, 587, or 465).
- The email is delivered to the recipients server.
- The recipient then retrieves it using IMAP or POP3.
Key Features:
- SMTP is connection-oriented and text-based.
- It supports commands like HELO, MAIL FROM, and RCPT TO.
- Often secured using SSL/TLS for encrypted email delivery.
Conclusion: SMTP is the correct and widely used protocol to send emails across networks. Therefore, the correct answer is SMTP.
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