send mail status

211 - A system status message.

214 - A help message for a human reader follows.

220 - SMTP 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 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 message input and end with <CRLF>.<CRLF>. This indicates that the server is ready to accept the message itself (after you have told it who it is from and where you want to to go).

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 because it was locked). Try again later.

451 - The command has been aborted due to a server error. Not your fault. Maybe let the admin know.

452 - The command has been aborted because the server has insufficient system storage.

The following error messages (500-504) usually tell you that your email client is broken. It's probably best to let the program's author know.

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. Blame it on the weather.