SOAPWebServicesErrorDomain Code=-997 prevents mail retrieval

Originator:jon.baumgartner
Number:rdar://33723217 Date Originated:08/04/2017
Status: Resolved:
Product:Mail Product Version:9.3 (3124)
Classification:Serious Bug Reproducible:Always
 
Since August 1st, I have been unable to receive email from my Exchange account. I started receiving the following messages repeated every second in the Console:

Aug  1 14:05:20 Kobol Mail[850]: -[SOAPParser:0x7fd686c96db0 parser:didStartElement:namespaceURI:qualifiedName:attributes:] Type not found in EWSMeetingRequestMessageType for DoNotForwardMeeting (t:DoNotForwardMeeting)
Aug  1 14:05:20 Kobol Mail[850]: Received an unexpected error: Error Domain=SOAPWebServicesErrorDomain Code=-997 "(null)"

The only way to stop the error messages was to disable Mail and Calendars for the Exchange account.

This only happens on my El Capitan Mac. I can receive email on my Sierra Mac, and I get no error messages.

This is being discussed here: https://discussions.apple.com/thread/8021625?start=15&tstart=0

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