1. Computing

Discuss in my forum

Understanding SMTP Error Messages

List of SMTP Server Response Codes

By

  • 211 - A system status message.
  • 214 - A help message for a human reader follows.
  • 220 - SMTP Service ready.
  • 221 - Service closing.
  • 250 - Requested action taken and completed. The best message of them all.
  • 251 - The recipient is not local to the server, but the server will accept and forward the message.
  • 252 - The recipient cannot be VRFYed, but the server accepts the message and attempts delivery.
  • 354 - Start message input and end with <CRLF>.<CRLF>. This indicates that the server is ready to accept the message itself (after you have told it who it is from and where you want to to go).
  • 421 - The service is not available and the connection will be closed.
  • 450 - The requested command failed because the user's mailbox was unavailable (for example because it was locked). Try again later.
  • 451 - The command has been aborted due to a server error. Not your fault. Maybe let the admin know.
  • 452 - The command has been aborted because the server has insufficient system storage.

The following error messages (500-504) usually tell you that your email client is broken. It's probably best to let the program's author know.

  • 500 - The server could not recognize the command due to a syntax error.
  • 501 - A syntax error was encountered in command arguments.
  • 502 - This command is not implemented.
  • 503 - The server has encountered a bad sequence of commands.
  • 504 - A command parameter is not implemented.
  • 550 - The requested command failed because the user's mailbox was unavailable (for example because it was not found, or because the command was rejected for policy reasons).
  • 551 - The recipient is not local to the server. The server then gives a forward address to try.
  • 552 - The action was aborted due to exceeded storage allocation.
  • 553 - The command was aborted because the mailbox name is invalid.
  • 554 - The transaction failed. Blame it on the weather.

©2014 About.com. All rights reserved.