Hello! We did introduce some fixes for some issues that might be related to the behavior you're seeing so I recommend trying an upgrade after getting a full backup of the environment beforehand. If that doesn't help please let me know and I can get a ticket started so we can look into this further.

Hello Kyle,

thank you for your reply.

I've upgraded to build 8860. I'll let you know as soon as a message from the affected sender arrives.

Ale

You're very welcome, happy to help out. Sounds good! 

Hello Kyle,

a new message just arrived, and the issue still persists (Ok in Outlook/MAPI - Corrupted in Apple mail/EWS).

Thank you

Hello! That is unfortunate, but gets one of our checks out of the way. You have active maintenance and support, so I'm going to get a ticket started so we can check this out for you. Thank you!