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.Check the RFC index for further mail-related RFCs.
Code |
Meaning |
200 |
(nonstandard success response, see rfc876) |
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 unrecognised |
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 (???a Sendmailism) |
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 |
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