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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