Which SMTP command is used to define the recipients of a message?

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Multiple Choice

Which SMTP command is used to define the recipients of a message?

Explanation:
In SMTP, recipients are defined with the RCPT TO command. After declaring the sender with MAIL FROM, the client issues RCPT TO for each recipient address, and the server responds indicating whether each address is accepted. Once all recipients are specified, the client issues DATA to begin the message content. The other commands don’t serve this purpose: EXPN expands a mailing list to its individual addresses, VRFY verifies that a mailbox exists, and DNS zone transfer is a DNS operation unrelated to SMTP.

In SMTP, recipients are defined with the RCPT TO command. After declaring the sender with MAIL FROM, the client issues RCPT TO for each recipient address, and the server responds indicating whether each address is accepted. Once all recipients are specified, the client issues DATA to begin the message content. The other commands don’t serve this purpose: EXPN expands a mailing list to its individual addresses, VRFY verifies that a mailbox exists, and DNS zone transfer is a DNS operation unrelated to SMTP.

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