Email Policies & Exceptions File Protection
When selecting Compressed Files to block, the system erroneously filters out winmail.dat mime type Application/MS-TNEF files. winmail.dat is used by senders using Rich Text Format mail.
Application/MS-TNEF mime type is not available at all to whitelist.
Please rectify this ASAP.
+1 for case 8493048
Louis Swanepoel commented
The "Compressed Files" selection also seems to block application/octet-stream, without it being available to whitelist.