3.2.5.1 Sending a SASL_Mechanism_Supported Message

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When the server receives an AUTH command that does not include the optional initial response, as specified in [RFC4954] section 4, and the specified SASL mechanism provides an empty server string to include in the server challenge, the server SHOULD respond with a SASL_Mechanism_Supported message, as specified in section 2.2.1.