Forum Discussion

MVP

Feb 09, 2017

Disabled TNEF and messages with PDF still arrive as winmail.dat

Hello, some of our customers and our users using Office 365 start see after last builds Office 2016 strange things about sending e-mails with PDF attachments. Outside world complain, that they re...

office 365

Loryan Strant

MVP

Feb 12, 2017

If you've done it at the tenant level then it *should* be working.

This article might help, but you've probably already done it all: http://www.deargeek.co.uk/2013/11/how-to-stop-office-365-sending-those-pesky-winmail-dat-attachments/

Otherwise I'd suggest creating a Service Request to see if perhaps the TNEF setting isn't actually being applied.

Kazzan

MVP

Feb 13, 2017

Thanks to reply, Loryan.

Yes, we did that on tenant level in Exchange. We also full patch all Outlook 2016 clients and check their settings and they seems to be correct at contact or application level.

We now try to create explicit Mail Contacts to such problematic external users with TNEF disabled, maybe it helps. We also created Service Request to official support, but no progress so I also wrote here for sure.