Which of the following standards is concerned with message handling?

The correct answer is A. X.400. X.400 is used in e-mail as a message handling protocol. X.500 is used in directory services. X.509 is used in digital certificates and X.800 is used a network security standard.

Submitted by joshua94· Apr 18, 2026Network and Communications Security

Question

Which of the following standards is concerned with message handling?

Options

AX.400
BX.500
CX.509
DX.800

How the community answered

(37 responses)

A
86% (32)
B
3% (1)
C
8% (3)
D
3% (1)

Explanation

X.400 is used in e-mail as a message handling protocol. X.500 is used in directory services. X.509 is used in digital certificates and X.800 is used a network security standard.

Topics

#X.400#Message Handling Systems#ITU-T standards#Communication Protocols

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