2.2.1.8 SMTP_NTLM_Not_Supported_Response Message

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 The SMTP_NTLM_Not_Supported_Response_Message is defined as follows. This message is defined in [RFC2554] section 4 and indicates that the authentication mechanism is not supported by the server. The server rejects the AUTH command with the following message.

 504 <human-readable-string><CR><LF>