Sendmail: return codes

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.
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 .. 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 (full ?). Try again later.
451 – The command has been aborted due to a server error. (on their side)
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 (such as not found)
551 – The recipient is not local to the server.
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 for some unstated reason.

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