30 lines
1.4 KiB
Markdown
30 lines
1.4 KiB
Markdown
# SMTP Response Codes
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**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**.
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| Status Code | Description |
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| --- | --- |
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| 211 | System status or system help response |
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| 214 | Help message |
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| 220 | Service ready |
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| 221 | Service closing transmission channel |
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| 235 | Authentication successful |
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| 250 | Requested mail action completed |
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| 251 | User not local; will forward |
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| 252 | Cannot verify the user; will attempt delivery |
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| 354 | Start mail input; end with `<CRLF>.<CRLF>` |
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| 421 | Service not available, closing transmission channel |
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| 450 | Requested action not taken - mailbox unavailable |
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| 451 | Requested action aborted: local error in processing |
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| 452 | Requested action not taken - insufficient system storage |
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| 500 | Syntax error, command unrecognized |
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| 501 | Syntax error in parameters or arguments |
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| 502 | Command not implemented |
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| 503 | Bad sequence of commands |
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| 504 | Command parameter not implemented |
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| 550 | Requested action not taken - mailbox unavailable |
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| 551 | User not local; please try `<forward-path>` |
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| 552 | Requested mail action aborted - exceeded storage allocation |
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| 553 | Requested action not taken - mailbox name not allowed |
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| 554 | Transaction failed |
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