What works as an E-mail message transfer agent?

The correct answer is A. SMTP. SMTP (Simple Mail Transfer Protocol) is the standard protocol used to transfer email messages between mail servers and from mail clients to servers. It operates on port 25 (or 587 for submission) and is responsible for the actual transport of email across the Internet. SNMP (B) i

Submitted by yasin.bd· Apr 18, 2026Network and Communications Security

Question

Options

ASMTP
BSNMP
CS-RPC
DS/MIME

How the community answered

(26 responses)

A
96% (25)
C
4% (1)

Explanation

SMTP (Simple Mail Transfer Protocol) is the standard protocol used to transfer email messages between mail servers and from mail clients to servers. It operates on port 25 (or 587 for submission) and is responsible for the actual transport of email across the Internet. SNMP (B) is for network device management, S-RPC (C) is a secure remote procedure call mechanism, and S/MIME (D) is a standard for encrypting and signing email content - not for transferring it.

Topics

#Email protocols#SMTP#Network protocols#Application layer

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