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3.1.5.6 Receiving an SMTP_AUTH_Other_Failure_Response Message

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When this message is received and the client state equals sent_command, the SMTP client MUST change its internal state to completed_authentication and consider that the authentication has failed. The client then takes any action it considers appropriate. This document does not mandate any specific course of action.

Note This response MUST be interpreted using the rules specified in [RFC2821]. These rules include using the three-digit status code to infer whether the failure is permanent or temporary, whether or not to generate non-delivery notifications for messages queued on the client, and so on.