3.2.5.1.2.3 NTLM Returns a Failure Status, Indicating User Name or Password Was Incorrect

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If the server passes an AUTHENTICATE_MESSAGE NTLM message and the NTLM subsystem returns status that indicates that the user name or password was incorrect, the server MUST return the IMAP4_AUTHENTICATE_NTLM_Fail_Response message and change its internal state to completed_authentication.