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Thanks for the feedback.
I would like to confirm whether you are only using Exchange server.
If yes, I suggest you post the issue in our Exchange server forum for a better response.
If not, could you please provide the mail header for further research?
I have sent you a private message asking for the mail header. Here are the steps to check it:
• Go to the Your details section on the right side of the community site.
• Click Private messages.
• Click the subject title of the response to read the message.
• You can reply by using the form on this display.
• Click Submit Reply.
I have received your private message about the information of the mail header. And, I suggest you contact our FOPE team for a better response. You can get the contact information via the private message I have replied to you.