Blanks emails when userproperties is filled with some internal data

Copper Contributor

We face a problem since a few days.
Most of our emails sent are viewed as blank in Outlook, but we can read them in a Webmail (not
After spending hours to investigate (settings etc..)
I have found that emails sent with some Outlook.UserProperties pre-filled by our applications (we use internal properties to manage automatic email classification)
are not displayed in Outlook.
When removing the automatic fill of UserProperties within the mail, the mail is well displayed.

Could you come back to me with a fix in Outlook.


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