Standard SMTP error codes ( email bounce error codes )

200 Codes
211 – System status / system help reply
214 – Help message
220 – Domain service ready
221 – Domain service closing transmission channel
250 – Requested mail action completed and OK
251 – Not Local User, forward email to forward path
252 – Cannot Verify user, will attempt delivery later
253 – Pending messages for node started

300 Codes
354 – Start mail input; end with .
355 – Octet-offset is the transaction offset

400 Codes
421 – Domain service not available, closing transmission channel
432 – Domain service not available, closing transmission channel
450 – Requested mail action not taken: mailbox unavailable. request refused
451 – Requested action aborted: local error in processing Request is unable to be processed, try again
452 – Requested action not taken: insufficient system storage
453 – No mail
454 – TLS not available due to temporary reason. Encryption required for requested authentication mechanism
458 – Unable to queue messages for node
459 – Node not allowed: reason

500 Codes
500 – Syntax error, command unrecognized
501 – Syntax error in parameters or arguments
502 – Command not implemented
503 – Bad sequence of commands
504 – Command parameter not implemented
510 – Check the recipient address
512 – Domain can not be found. Unknown host.
515 – Destination mailbox address invalid
517 – Problem with senders mail attribute, check properties
521 – Domain does not accept mail
522 – Recipient has exceeded mailbox limit
523 – Server limit exceeded. Message too large
530 – Access Denied. Authentication required
531 – Mail system Full
533 – Remote server has insufficient disk space to hold email
534 – Authentication mechanism is too weak. Message too big
535 – Multiple servers using same IP. Required Authentication
538 – Encryption required for requested authentication mechanism
540 – Email address has no DNS Server
541 – No response from host
542 – Bad Connection
543 – Routing server failure. No available route
546 – Email looping
547 – Delivery time-out
550 – Requested action not taken: mailbox unavailable
551 – User not local; please try forward path
552 – Requested mail action aborted: exceeded storage allocation
553 – Requested action not taken: mailbox name not allowed
554 – Transaction failed

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