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      Question

      Which of the following protocols is used for sending

      emails and on which port does it operate by default?
      A IMAP β€” Port 143 Correct Answer Incorrect Answer
      B POP3 β€” Port 110 Correct Answer Incorrect Answer
      C SMTP β€” Port 25 Correct Answer Incorrect Answer
      D FTP β€” Port 21 Correct Answer Incorrect Answer
      E HTTP β€” Port 80 Correct Answer Incorrect Answer

      Solution

      SMTP (Simple Mail Transfer Protocol) is used for sending emails between mail servers, operating on port 25 (or port 587 for submission with authentication, or 465 for SMTPS with SSL). For receiving emails: IMAP (Internet Message Access Protocol) β€” port 143/993 (SSL) β€” synchronizes mail across devices; POP3 (Post Office Protocol 3) β€” port 110/995 (SSL) β€” downloads and typically deletes from server. Banks use SMTP servers with TLS for sending transaction alerts, OTPs, and account statements.

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