How often do you get "FATAL ERROR: Could not send your message. Error #550" when sending email? What does "Error #550" mean?
In this section you will find short description of SMTP/ESMTP error codes and error messages you need to know to understand why your email was not send and what to do.
A mail server will reply to every request your mail client (such as your email program, like Outlook Express, Eudora or Atomic Mail Sender etc.) makes with a return code. This code consists of 3 digits:
The first digit tells whether the server accepted the command and if it could handle it. There are 5 possible values:
Second digit tells more. There are six possible values:
The third digit tells more then second again. It shows more graduations of the mail transferring status.
Combination of these three digits gives us detailed list of ESMTP server response codes, as laid down in RFC 821 and later extensions (Check the RFC index for further mail-related RFCs).
|Error code||SMTP/ESMTP error message description|
|211||System status, or system help reply|
|214||Help message (information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user)|
|250||Requested mail action okay, completed|
|251||User not local; will forward to
|354||Start mail input; end with
|450||Requested mail action not taken: mailbox unavailable (e.g., mailbox busy)|
|451||Requested action aborted: local error in processing|
|452||Requested action not taken: insufficient system storage|
|500||Syntax error, command unrecognized (this may include errors such as command line too long)|
|501||Syntax error in parameters or arguments|
|502||Command not implemented|
|503||Bad sequence of commands|
|504||Command parameter not implemented|
|550||Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access)|
User not local; please try
|552||Requested mail action aborted: exceeded storage allocation|
|553||Requested action not taken: mailbox name not allowed (e.g., mailbox syntax incorrect)|
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