Hi Chris, We have recently encountered the same behaviour and we also believe it to be an issue on Microsofts end. We have confirmed that if you alter the headers to remove the "Original" component then the signatures will validate again (which is not something we should need to do) We'll be going through our support contract with Microsoft in the hope of a resolution
Regards, Jason Jason Stephenson Principal Software Engineer m: p: +44 207 847 8700 w: https://www.mimecast.com Address: https://www.mimecast.com/company/contact/ Work Protected.™
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