1.4 KiB
1.4 KiB
SMTP Response Codes
SMTP Response Codes, also known as SMTP Status Codes, are used to indicate the success or failure of an SMTP command. They are typically sent by an SMTP server in response to an SMTP command issued by an SMTP client.
| Status Code | Description |
|---|---|
| 211 | System status or system help response |
| 214 | Help message |
| 220 | Service ready |
| 221 | Service closing transmission channel |
| 235 | Authentication successful |
| 250 | Requested mail action completed |
| 251 | User not local; will forward |
| 252 | Cannot verify the user; will attempt delivery |
| 354 | Start mail input; end with <CRLF>.<CRLF> |
| 421 | Service not available, closing transmission channel |
| 450 | Requested action not taken - mailbox unavailable |
| 451 | Requested action aborted: local error in processing |
| 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 |
| 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 |