SMTP (Simple Mail Transfer protocol) receives outgoing mail from clients and validates source and destination addresses, and also sends and receives emails to and from other SMTP servers.

• A. False
• B. It handles POP3 mail retrieval
• C. True
• D. It only validates internal mail

Answer: (C)

SMTP governs the sending and relaying of email. It accepts mail from clients (submission) and transfers it to destination mail servers, performing validation of the envelope sender and recipient addresses as part of the process. It also handles the transfer of mail between SMTP servers, both sending and receiving. It does not handle mail retrieval from servers—that role belongs to POP3 or IMAP—so a statement claiming SMTP retrieves mail would be incorrect. Therefore, describing SMTP as doing these sending/relaying and address-validation tasks is true.