2.2.22 [RFC5545] Section 3.2.18 Sent By

V0029:

The specification describes the optional SENT-BY parameter.

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019

Microsoft Exchange Server exports the SENT-BY parameter if the sender is not the organizer for requests or participant for responses. Microsoft Exchange imports the SENT-BY parameter if present.