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Which of the following code indicates the response as "Mailbox not available"?

Which of the following code indicates the response as "Mailbox not available"? Correct Answer 450

The correct answer is option 1.

Concept:

A message transfer agent receives incoming emails and forwards the messages to individual clients/users. The main function of the MTA is forwarding the incoming message to the proper end-user or destination.  Message Transfer Agent (MTA) is a mail daemon that helps to transmit/receive messages over the network. To send mail a system must have the client MTA, and to receive mail a system must have a server MTA.

Common code responses sent from server MTA are:

  • 220 Service ready
  • 221 Service closing transmission channel
  • 250 Request completed
  • 354 Start mail input
  • 450 Mailbox not available
  • 500 Syntax error; unrecognized command
  • 550 Command not executed, mailbox unavailable
  • 551 User not local

Hence the correct answer is 450.

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