SMTP Reply codes

Code     Meaning

200     (nonstandard success response, see rfc876)
211     System status, or system help reply
214     Help message
220     <domain> Service ready
221     <domain> Service closing transmission channel
250     Requested mail action okay, completed
251     User not local; will forward to <forward-path>
354     Start mail input; end with <CRLF>.<CRLF>
421     <domain> 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     <domain> does not accept mail (see rfc1846)
530     Access denied (???a Sendmailism)
550     Requested action not taken: mailbox unavailable
551     User not local; please try <forward-path>
552     Requested mail action aborted: exceeded storage allocation
553     Requested action not taken: mailbox name not allowed
554     Transaction failed

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