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E-mails changed to << File: winmail.dat >>

Posted on 2004-04-05
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Last Modified: 2010-03-05
Hi guys,

This is a Exchange and Windows 2000 environment.
One of my users repoted that when she sends email to some people, reciever cannot open it.
Email is recived in a file with .dat extension like << File: winmail.dat >> 
Actually original email does not have any attachments, only message text.

I would appreciate any respond to that issue.

Thanks,



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Question by:cakirfatih
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seeimred earned 500 total points
ID: 10762100
If the recieving end isn't using Exchange or Outlook, then your user needs to send to those people in Plain Text format. The winmail.dat attachment is a result of MS Proprietary message encapsulation called Transport Neutral Encapsulation Format (affectionately known as TNEF). TNEF is enabled by default when the message is composed in RTF or HTML. It's basically a wrapper around the body & it's attachments. The winmail.dat appears at it's destination. Usually the destination server or client isn't a Microsoft product, it can't unwrap the TNEF wrapper properly so it tries it's best. It doesn't know if it is an essential part so it retains it as an attachment called winmail.dat. Sometimes the unwrapping is so bad that it takes the body with the winmail.dat and all the user has left is the header.

Here's some articles dealing with this subject:
OL2000: Transport Neutral Encapsulation Format (TNEF) Basics http://support.microsoft.com/default.aspx?scid=kb;en-us;224817
OL2000: (CW) Winmail.dat Attachments Included in Received Messages  http://support.microsoft.com/default.aspx?scid=kb;en-us;197064
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by:cakirfatih
ID: 10766513
it worked perfect
thanks
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