What are the different traditional bounce codes?

Here is a list of traditional bounce codes:

Code	Type	Explanation
420	Soft	Timeout connection problem: there were issues during the message transfer.
421	Soft	The recipient server temporarily deferred the message due to too many messages or too many connections in a short timeframe.
422	Soft	The recipient’s mailbox has exceeded its storage limit.
431	Soft	Not enough space on the disk or an ‘out of memory’ condition due to a file overload.
432	Soft	Typical side-message: ‘The recipient’s exchange server’s incoming mail queue has been stopped’.
441	Soft	The recipient’s server is not responding.
442	Soft	The connection dropped during the transmission.
446	Soft	The maximum hop count has exceeded for the message: an internal loop has occurred.
447	Soft	Your outgoing message timed out because of issues concerning the incoming server.
449	Soft	A routing error - bad routing configuration or temporary routing issues, users may encounter an exchange server error.
450	Soft	Requested mail action not taken: mailbox unavailable. (For example, mailbox busy).
451	Soft	Requested action aborted: error in processing.
452	Soft	Requested action not taken: insufficient system storage.
471	Soft	An error in your mail server, often due to an issue with the local anti-spam filter.
500	Hard	The server could not recognize the command due to a syntax error.
501	Hard	A syntax error was encountered in command arguments.
502	Hard	This command is not implemented.
503	Hard	The server has encountered a bad sequence of commands.
504	Hard	The command parameter is not implemented.
510	Hard	Bad email address.
511	Hard	Bad email address.
512	Hard	A DNS error: the host server for the recipient’s domain name cannot be found.
513	Hard	‘Address type is incorrect’: another problem concerning address misspelling. In few cases, however, it’s related to an authentication issue
523	Hard	The total size of your mailing exceeds the recipient server’s limits.
530	Hard	Typically, an authentication problem, but sometimes, it is about the recipient’s server blacklisting yours or an invalid email address.
541	Hard	The recipient address rejected your message: typically, it is an error caused by an anti-spam filter.
550	Hard	The user’s mailbox was unavailable (such as - not found).
551	Hard	The recipient is not local to the server.
552	Hard	The action was aborted due to exceeded storage allocation.
553	Hard	The command was aborted because the mailbox name is invalid.
554	Hard	The transaction failed for some unstated reason.

FAQs in this section

What are the different traditional bounce codes?

Table of Contents

Comments 0