Which protocol is used to transmit email from a client to a mail server?

Which protocol is used to transmit email from a client to a mail server?

• A. POP3
• B. IMAP4
• C. SMTP
• D. HTTP

Answer: (C)

SMTP is the protocol used to transmit email from a client to a mail server. It stands for Simple Mail Transfer Protocol and is designed for delivering messages from a sender’s mail client to the recipient’s mail server, and for transferring messages between servers. Retrieval protocols like POP3 and IMAP4 are used to fetch mail from the server to the client, not to send it. HTTP is for web traffic and not involved in email transport. In practice, a client sends email via SMTP (often over TLS on port 587 or 465), while the recipient retrieves it using POP3 or IMAP.

SMTP is the protocol used to transmit email from a client to a mail server. It stands for Simple Mail Transfer Protocol and is designed for delivering messages from a sender’s mail client to the recipient’s mail server, and for transferring messages between servers. Retrieval protocols like POP3 and IMAP4 are used to fetch mail from the server to the client, not to send it. HTTP is for web traffic and not involved in email transport. In practice, a client sends email via SMTP (often over TLS on port 587 or 465), while the recipient retrieves it using POP3 or IMAP.