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What are the different traditional bounce codes?

Table of Contents
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.

To know more about Email Bounces and Error Codes, click here.
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