SMTP Error Codes / SMTP Status Messages.
Here is a list of SMTP error / status codes and their meanings:
| Code |
Description |
| 211 |
System status or system help reply. |
| 214 |
Help message. |
| 220 |
Domain service ready - ready to start TLS. |
| 221 |
Domain service closing transmission channel. |
| 250 |
OK - queuing for node node started - requested mail action okay, completed. |
| 251 |
OK - no messages waiting for node node - user not local will forward to forwardpath. |
| 252 |
OK - pending messages for node node started - cannot VRFY user but will accept message and attempt delivery. |
| 253 |
OK - messages pending - messages for node started. |
| 354 |
Start mail input - end with <CRLF>.<CRLF>. |
| 355 |
Octet-offset is the transaction offset. |
| 421 |
Domain service not available - closing transmission channel. |
| 432 |
A password transition is needed. |
| 450 |
Requested mail action not taken - mailbox unavailable - ATRN request refused. |
| 451 |
Requested action aborted - local error in processing - wnable to process ATRN request. |
| 452 |
Requested action not taken - insufficient system storage. |
| 453 |
You have no mail. |
| 454 |
TLS not available due to temporary reason - encryption is required for requested authentication mechanism. |
| 458 |
Unable to queue messages for node node. |
| 459 |
Node node not allowed: reason. |
| 500 |
Command not recognized 'command' - syntax error. |
| 501 |
Syntax error - no parameters allowed. |
| 502 |
Command not implemented. |
| 503 |
Bad sequence of commands. |
| 504 |
Command parameter not implemented. |
| 521 |
Machine does not accept mail. |
| 530 |
Must issue a STARTTLS command first - encryption required for requested authentication mechanism. |
| 534 |
Authentication mechanism is too weak. |
| 538 |
Encryption required for requested authentication mechanism. |
| 550 |
Requested action not taken - mailbox unavailable. |
| 551 |
User not local - please try forwardpath. |
| 552 |
Requested mail action aborted - exceeded storage allocation. |
| 553 |
Requested action not taken - mailbox name not allowed. |
| 554 |
Transaction failed. |
For a solution to many common SMTP errors or mail sending problems see AuthSMTP.
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