| 200 – |
(nonstandard success response, see rfc876) |
| 211 – |
System status, or system help reply |
| 214 – |
Help message |
| 220 – |
SMTP Service ready |
| 221 – |
Service closing transmission channel |
| 250 – |
Requested mail action okay, completed |
| 251 – |
The recipient is not local to the server, but the server will accept and forward the message. |
| 252 – |
The recipient cannot be VRFYed, but the server accepts the message and attempts delivery. |
| 354 – |
Start mail input; end with <CRLF>.<CRLF> |
| 421 – |
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 – |
Server does not accept mail |
| 530 – |
Access denied |
| 550 – |
Requested action not taken: mailbox unavailable |
| 551 – |
User not local; please try forward address |
| 552 – |
Requested mail action aborted: exceeded storage allocation |
| 553 – |
Requested action not taken: mailbox name not allowed |
| 554 – |
Transaction failed |
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