FAQ / Server Products

Why is Hexamail not processing signatures or marketing inserts for some recipients?
It says "Message part has content type
application/ms-tnef. Not adding insert."
Outlook sometimes sends email in a proprietary MS format when it thinks the recipient is also using Outlook. This often happens if the recipient is at the same domain. This is a bug in Outlook and causes the recipient to receive a winmail.dat file, and prevents modification of the email content in transit between the parties.
To prevent Outlook sending in a non standard and unreadable format please consult this information:
http://www.slipstick.com/problems/outlook-is-sending-winmail-dat-attachments/

There are also the following guides: