Canon VK-64 Administrator's Manual page 265

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A List of SMTP Error Codes
Codes
421 <domain> Service not available, closing
transmission channel
450 Requested mail action not taken:
mailbox unavailable
451 Requested action aborted: local error in
processing
502 Command not implemented
550 Requested action not taken: mailbox
unavailable
Error Messages
List of Messages
Description
The communication is terminated
because the mail server stopped.
The requested mail process was not
executed because the mailbox is not
available.
The requested execution was canceled
because an error occurred in the mail
server.
The mail server does not support the
command that was sent.
The request was not executed because
the mailbox is not available.
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