2.2.29 [RFC3501] Section 7.1.1, OK Response

V0050:

The specification states: "The untagged form indicates an information-only message; the nature of the information MAY be indicated by a response code."

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016

Microsoft Exchange Server sends an untagged OK response that includes human-readable text with no response code.

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