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List of SMTP Error Codes

What is SMTP?

SMTP standard for Simple Mail Transfer Protocol.SMTP is part of the application layer of the TCP\IP Protocol used in sending and receiving Email.

smtp-error-code

List of SMTP Error Codes

100 Codes
101 - The server is unable to connect
111 - Connection refused or inability to open an SMTP stream.

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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