Our accounting program Exact Accounting automatically sends email statements to customers via Outlook 2013. The statement is comprised of a subject line, an attached pdf, and a blank body. Multiple customers are receiving the winmail.dat file instead of the pdf.
These are the steps I have taken, that have not solved the issue:
Outlook is configured to send HTML.
I have used powershell to set the Exchange Online server to default to TNEF to false.
I have used powershell to add domain objects for 2 different customer domains to default their TNEF to false.
Any suggestions please? Why is the exchange server still encapsulating in this TNEF - what am I missing?