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We have all had those cryptic error messages when we have emails which are not delivered. The following is a list of most of these. From here on, you can at least get a better understaning of why some of these events may be occuring. This, you may have a capability to adjust the problem. Good luck and more success!
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SMTP Error Messages: The Meaning of the Numbers
All robust-email users
encounter returned messages. When reading the reasons given for the returns, a large
percentage of the senders do not understand the explanations. The following list
provides brief definitions for the most common email errors. They are important
to refer to from a Netiquette point of view, as understanding messages and
unavoidable errors can help you to avoid issues such as missing deadlines or similar
occurrences.
An email server
will reply to every request a client (such as your email program) makes with a return
code[. This code consists
of three numbers. The first number usually signifies whether the server accepted
the command and if it could handle it. There are five possible values defined
as follows:
·
0: A syntax error has occurred.
·
1 (informational
reply to a request): The server has accepted the
command but does not yet take action. A confirmation message is required.
Currently, this is not used.
·
2 (a referral to the connection status): The server has completed the task successfully.
·
3 (not generally used): The server has
understood the request but requires further information to complete it.
·
4 (not generally used):
The server has encountered a temporary failure.
·
5 (refers
to the status of the mail system and the mail server): The server has
encountered an error.
The second number in this list gives more information . The last number
is the best recognized and shows more detail of the mail transfer status.
The list names the following ESMTP
(enhanced mail server transfer protocol) server-response codes, as defined in RFC 821 extensions . What they
indicate follows:
·
21: 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
·
251: The recipient is not local to the server, but the server will accept
and forward the message.
·
252: The recipient cannot be verified, but the server accepts the message
and attempts delivery.
·
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.
·
452: The command has been aborted because the server has insufficient
system storage.
·
500: The server could not recognize the command due to a syntax error.
·
501: A syntax error has been encountered in command arguments.
·
502: Bad gateway.
·
503: The server has encountered a bad sequence of commands.
·
504: A command parameter is not implemented.
·
550: The user’s mailbox is unavailable. Either it no longer exists or
the message was blocked for security or policy rules.
·
551: The recipient is not local to the server.
·
552: The action has been aborted due to exceeded storage allocation.
·
553: The command has been aborted because the mailbox name is invalid.
·
554: The transaction failed. There could be many reasons for this, such
as an outage or software or network failure.
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Good Netiquette And A Green Internet To All!
==============================================
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·
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In addition to this blog, Netiquette IQ has a website with great assets which are being added to on a regular basis. I have authored the premiere book on Netiquette, “Netiquette IQ - A Comprehensive Guide to Improve, Enhance and Add Power to Your Email". My new book, “You’re Hired! Super Charge Your Email Skills in 60 Minutes. . . And Get That Job!” will be published soon follow by a trilogy of books on Netiquette for young people. You can view my profile, reviews of the book and content excerpts at:
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If you would like to listen to experts in all aspects of Netiquette and communication, try my radio show on BlogtalkRadio Additionally, I provide content for an online newsletter via paper.li. I have also established Netiquette discussion groups with Linkedin and Yahoo. I am also a member of the International Business Etiquette and Protocol Group and Minding Manners among others. Further, I regularly consult for the Gerson Lehrman Group, a worldwide network of subject matter experts and have been a contributor to numerous blogs and publications.
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