Which port is used by SMTP (Simple Mail Transfer Protocol)?

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Multiple Choice

Which port is used by SMTP (Simple Mail Transfer Protocol)?

Explanation:
SMTP handles the delivery of email and relies on a specific network channel for sending messages between servers and from clients to a mail server. The standard port associated with SMTP traffic is the default channel used for this purpose. That’s why port 25 is used for SMTP. For contrast, the other ports serve different tasks: one is used for retrieving mail from a server to a client (POP3), another for a different mail retrieval protocol (IMAP), and port 80 is for web traffic (HTTP). In practice, modern client submission often uses port 587 with authentication and STARTTLS, while port 25 remains the traditional SMTP relay port.

SMTP handles the delivery of email and relies on a specific network channel for sending messages between servers and from clients to a mail server. The standard port associated with SMTP traffic is the default channel used for this purpose. That’s why port 25 is used for SMTP.

For contrast, the other ports serve different tasks: one is used for retrieving mail from a server to a client (POP3), another for a different mail retrieval protocol (IMAP), and port 80 is for web traffic (HTTP). In practice, modern client submission often uses port 587 with authentication and STARTTLS, while port 25 remains the traditional SMTP relay port.

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