Which standard networking protocol is used by email clients to send emails to mail servers?
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Which standard networking protocol is used by email clients to send emails to mail servers?
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Answer: A. SMTP
Simple Mail Transfer Protocol (SMTP) is the standard TCP/IP protocol used for sending and routing outgoing email messages.
Step-by-step Derivation:
Step 1: Email retrieval uses POP3 or IMAP.
Step 2: Email submission and transfer between servers uses SMTP (port 25, 465, or 587).