SMTP reply codes
The list below is a standard list with the SMTP reply codes according to the SMTP standard. Beware however that this is just a standard, and that certain SMTP servers might return their own status, codes and descriptions that differ from the list below.
Code | Status (SMTP Error) | Description |
---|---|---|
211 | 2.1.1 | System status, or system help reply |
214 | 2.1.4 | Help message |
220 | 2.2.0 | |
221 | 2.2.1 | |
250 | 2.5.0 | Requested mail action okay, completed |
251 | 2.5.1 | User not local; will forward to <forward-path> |
354 | 3.5.4 | Start mail input; end with <CRLF>.<CRLF> |
421 | 4.2.1 | <domain> Service not available, closing transmission channel |
450 | 4.5.0 | Requested mail action not taken: mailbox unavailable |
451 | 4.5.1 | Requested action aborted: local error in processing |
452 | 4.5.2 | Requested action not taken: insufficient system storage |
500 | 5.0.0 | Syntax error, command unrecognised |
501 | 5.0.1 | Syntax error in parameters or arguments |
502 | 5.0.2 | Command not implemented |
503 | 5.0.3 | Bad sequence of commands |
504 | 5.0.4 | Command parameter not implemented |
521 | 5.2.1 | <domain> does not accept mail |
530 | 5.3.0 | Access denied |
550 | 5.5.0 | Requested action not taken: mailbox unavailable |
551 | 5.5.1 | User not local; please try <forward-path> |
552 | 5.5.2 | Requested mail action aborted: exceeded storage allocation |
553 | 5.5.3 | Requested action not taken: mailbox name not allowed |
554 | 5.5.4 | Transaction failed |