troubleshooting Question

exchange calendar invitation broken to external exchange/office 365 servers

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Robert MulveyFlag for United States of America asked on
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exchange calendar invitation broken to external exchange/office 365 servers
When we send exchange calendar invitations it is broken to other exchange/office 365 servers but it appears to be ok when sent to linux servers

below is an example of a broken calendar invite when it is received.   The receiver cannot accept nor does it show up on their calendar, they only get a plain text email.  It also appears if we accept an external invitation but the acceptance is broken going back to them, it shows as not accepted/no status.    All other emails appear to be ok in terms of richtext/html and people receiving our attachments.  We have Exchange 2010/2016.  This issues has existed before 2016 was introduced.  The outgoing email is smart hosted thru our Cisco ESA Appliance aka IronPort.
example of broken invitation.
Robert Mulvey

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