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General Bounce Message Error Codes

The list below is a list of general bounce message error codes. Keep in mind that SMTP servers often use their own messages that are more detailed than then the ones in this list. You can also check the error code lists of: Hotmail / Live / Outlook.com, Yahoo and AOL.

Code:

Meaning:

200 Nonstandard success response, see rfc876
211 System status, or system help reply
214 Help message
220 Service ready
221 Service closing transmission channel
250 Requested mail action okay, completed
251 User not local; will forward to (forward-path)
354 Start mail input; end with (CRLF).(CRLF)
421 Service not available, closing transmission channel
450 Requested mail action not taken: mailbox unavailable
451 Requested action aborted: local error in processing
451 Greylisted, please try again in 600 seconds
452 Requested action not taken: insufficient system storage
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
521 Domain does not accept mail (see rfc1846)
530 Access denied
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