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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
530 5.7.0 Authentication required [3] 534 5.7.9 Authentication mechanism is too weak [3] 535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3] 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons)
Syntax error, command unrecognized and the requested action did not take place. This may include errors such as command line too long. 501: ... 530: Not logged in. 532:
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Usually, servers reject RCPT TO commands that imply relaying unless authentication credentials have been accepted. The specification recommends that servers issue 530 5.7.0 Authentication required in response to most commands in case the server is configured to require authentication and the client hasn't done it yet. Only servers listening on ...
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