Which of the following protocols are used to send messages to the e-mail server for relaying?
  1. Simple Mail Transfer Protocol (SMTP)
  2. Post Office Protocol, version 3 (POP3)
  3. Internet Control Message Protocol (ICMP)
  4. Internet Message Access Protocol, version 4 (IMAP4)
Explanation
Answer - A - SMTP is used to send messages to a mail server for relaying. It is a text-based protocol in which a mail sender communicates with a mail receiver by issuing simple command strings and supplying necessary data over a TCP connection.

Key Takeaway: SMTP is only a delivery protocol. It cannot pull messages from a remote server on demand. Protocols such as POP and IMAP are specifically designed for retrieving messages and managing mail boxes.
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