This article applies to:
- MailMarshal Exchange 5.3.X
- Exchange 2007
Symptoms:
- Error: "Invalid TNEF file – winmail.dat>"
Unpacking TNEF file.
Failed to load tnef objects. ReadExact: read only 1 bytes requested 4
TNEF file unpacking *FAILED*.
Event - Unpack for BA001387DD.0013A681.mml caught exception <Invalid TNEF file - winmail.dat>
- Affected messages are deadlettered by MailMarshal Exchange
Possible Cause:
- This error can occur when differing versions of Exchange 2007 are used within the same domain (for example Exchange 2007 SP1 Roll-up 6 and Exchange 2007 Roll-up 7).
- The winmail.dat file is actually corrupt - this is not a MailMarshal Exchange fault.
Possible Workarounds:
- It may be possible to resolve the problem by ensuring all Exchange 2007 instances within the domain/organization are on the same service pack level.
- With previous TNEF compatibility issues, Microsoft has recommended not using Word as email editor.
Notes:
There are other possible causes of TNEF unpacking errors. This error is specific to the environment named.