Oki 5780 manual The following are SMTP protocol error codes given in RFC821

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SMTP Protocol Error Codes

The following are SMTP protocol error codes given in RFC821.

RFC is an Internet “standards” term meaning “Request For Comment.” RFCs are documents that define standards or proposed standard-definitions for network and Internet operation. Individual RFCs define specific aspects of network or Internet operation.

When these occur, contact your network administrator.

E421 <domain>

Service not available, closing transmission channel.

This may be a reply to any command if the service knows it must shut down.

E450 Requested mail action not taken: mailbox unavailable.

Example: the mailbox is busy.

E451 Requested action aborted:

local error in processing

E452 Requested action not taken:

insufficient system storage

E500 Syntax error, command unrecognized.

This may include errors such as command line too long.

E501 Syntax error in parameters or arguments

E502 Command not implemented

E503 Bad sequence of commands

E504 Command parameter not implemented

E550 Requested action not taken: mailbox unavailable.

Example: mailbox not found, no access

E551 User not local; please try <forward-path>

E552 Requested mail action aborted: exceeded storage allocation

E553 Requested action not taken: mailbox name not allowed Example: Mailbox syntax incorrect

E554 Transaction failed

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Oki 5780 manual The following are SMTP protocol error codes given in RFC821