FAQs in this section
What are the different traditional bounce codes?
Here is a list of traditional bounce codes:
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| 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.