| 211 |
A system status message. |
| 214 |
A help message for a human reader follows. |
| 220 |
Service ready. |
| 221 |
Service closing. |
| 250 |
Requested action taken and completed. The best message of them all. |
| 251 |
The recipient is not local to the server, but it will accept and forward the message. |
| 252 |
The recipient cannot be VRFYed, but the server accepts the message and attempts delivery. |
| |
|
| 354 |
Start message input and end with <CRLF>.<CRLF>. This indicates that the server is ready to accept the message itself.
|
| 421 |
The service is not available and the connection will be closed. |
| 450 |
The requested command failed because the user's mailbox was unavailable (for example since it was locked). |
| 451 |
The command has been aborted due to a server error. Not your fault. |
| 452 |
The command has been aborted because the server has insufficient system storage. |
| |
|
| 500 |
The server could not recognize the command due to a syntax error. |
| 501 |
A syntax error was encountered in command arguments. |
| 502 |
This command is not implemented. |
| 503 |
The server has encountered a bad sequence of commands. |
| 504 |
A command parameter is not implemented. |
| 550 |
The requested command failed because the user's mailbox was unavailable (for example because
it was not found, or because the command was rejected for policy reasons). |
| 551 |
The recipient is not local to the server. The server then gives a forward address to try. |
| 552 |
The action was aborted due to exceeded storage allocation. |
| 553 |
The command was aborted because the mailbox name is invalid. |
| 554 |
The transaction failed. |
