SMTP Reply Codes
See rfc2821 for the basic specification of SMTP; see also rfc1123 for important additional information.
See rfc1893 and rfc2034 for information about enhanced status codes.
SMTP Reply Codes List
Code | Description |
200 | success response |
211 | System status, or system help reply |
214 | Help message |
220 | <domain> Service ready |
221 | <domain> Service closing transmission channel |
250 | Requested mail action okay, completed |
251 | User not local; will forward to <forward-path> |
354 | Start mail input; end with <CRLF>.<CRLF> |
421 | <domain> Service not available, closing transmission channel |
450 | Requested mail 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 |
521 | <domain> does not accept mail (see rfc1846) |
530 | Access denied () |
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 |
SMTP Reply Codes By Command
Command | Code | Description |
Connected | ||
220 | <domain> Service ready | |
421 | <domain> Service not available, closing transmission channel | |
HELO | ||
250 | Requested mail action okay, completed | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
504 | Command parameter not implemented | |
521 | <domain> does not accept mail [rfc1846] | |
421 | <domain> Service not available, closing transmission channel | |
EHLO | ||
250 | Requested mail action okay, completed | |
550 | Not implemented | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
504 | Command parameter not implemented | |
421 | <domain> Service not available, closing transmission channel | |
MAIL FROM | ||
250 | Requested mail action okay, completed | |
552 | Requested mail action aborted: exceeded storage allocation | |
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 | |
421 | <domain> Service not available, closing transmission channel | |
RCPT | ||
250 | Requested mail action okay, completed | |
251 | User not local; will forward to <forward-path> | |
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 | |
450 | Requested mail 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 | |
503 | Bad sequence of commands | |
521 | <domain> does not accept mail [rfc1846] | |
421 | <domain> Service not available, closing transmission channel | |
DATA | ||
354 | Start mail input; end with <CRLF>.<CRLF> | |
451 | Requested action aborted: local error in processing | |
554 | Transaction failed | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
503 | Bad sequence of commands | |
421 | <domain> Service not available, closing transmission channel | |
SEND | ||
250 | Requested mail action okay, completed | |
552 | Requested mail action aborted: exceeded storage allocation | |
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 | |
421 | <domain> Service not available, closing transmission channel | |
VRFY | ||
250 | Requested mail action okay, completed | |
251 | User not local; will forward to <forward-path> | |
550 | Requested action not taken: mailbox unavailable | |
551 | User not local; please try <forward-path> | |
553 | Requested action not taken: mailbox name not allowed | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
502 | Command not implemented | |
504 | Command parameter not implemented | |
421 | <domain> Service not available, closing transmission channel | |
Data Received | ||
250 | Requested mail action okay, completed | |
552 | Requested mail action aborted: exceeded storage allocation | |
554 | Transaction failed | |
451 | Requested action aborted: local error in processing | |
452 | Requested action not taken: insufficient system storage | |
RSET | ||
200 | (nonstandard success response, see rfc876) | |
250 | Requested mail action okay, completed | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
504 | Command parameter not implemented | |
421 | <domain> Service not available, closing transmission channel | |
SOML | ||
250 | Requested mail action okay, completed | |
552 | Requested mail action aborted: exceeded storage allocation | |
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 | |
421 | <domain> Service not available, closing transmission channel | |
SAML | ||
250 | Requested mail action okay, completed | |
552 | Requested mail action aborted: exceeded storage allocation | |
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 | |
421 | <domain> Service not available, closing transmission channel | |
EXPN | ||
250 | Requested mail action okay, completed | |
550 | Requested action not taken: mailbox unavailable | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
502 | Command not implemented | |
504 | Command parameter not implemented | |
421 | <domain> Service not available, closing transmission channel | |
HELP | ||
211 | System status, or system help reply | |
214 | Help message | |
500 | Syntax error, command unrecognized | |
501 | Syntax error in parameters or arguments | |
502 | Command not implemented | |
504 | Command parameter not implemented | |
421 | <domain> Service not available, closing transmission channel | |
NOOP | ||
200 | (nonstandard success response, see rfc876) | |
250 | Requested mail action okay, completed | |
500 | Syntax error, command unrecognized | |
421 | <domain> Service not available, closing transmission channel | |
QUIT | ||
221 | <domain> Service closing transmission channel | |
500 | Syntax error, command unrecognized | |
TURN | ||
250 | Requested mail action okay, completed | |
502 | Command not implemented | |
500 | Syntax error, command unrecognized | |
503 | Bad sequence of commands |