Toshiba E-STUDIO190F Service Manual page 279

9.8.10. NUMERIC ORDER LIST OF REPLY CODES
211 System status or system help reply
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
[This may be a reply to any command if the service knows it must shut down]
450 Requested mail action not taken: mailbox unavailable
[E.g.# mailbox busy]
451 Requested action aborted: local error in processing
452 Requested action not taken: insufficient system storage
500 Syntax error# command unrecognized
[This may include errors such as command line too long]
501 Syntax error in parameters or arguments
502 Command not implemented
503 Bad sequence of commands
504 Command parameter not implemented
550 Requested action not taken: mailbox unavailable
[E.g.# mailbox not found# no access]
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
[E.g.# mailbox syntax incorrect]
554 Transaction failed
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