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Exchange 2013 receiving attachments as winmail.dat

Posted on 2014-03-31
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Last Modified: 2014-10-21
recently i had the issue that users in my company were sending attachments as winmail.dat. i found that the fix for this problem turned out to be setting the default remote domain TNEFEnabled to False. This fixed the issue the we were sending winmail.dat.

However, since last week we have started receiving mails with attachments as winmail.dat. note that these are regular returning mails that have allways come trough without any problems, for some reason they are not getting trough anymore.
The original attachments vary from PDF files to Excel en Word documents.

Any help would be greatly appriciated.

Martijn Boevé
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Question by:tinus67
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rfportilla earned 1500 total points
ID: 39966916
The TNEF format is the issue.  You may need to do a little more reading to tweak this.  Outlook is the only mail client that I know that will support this.  So if you send it to a yahoo customer, they will get the winmail.dat.  It is independent of whether or not you there are attachments or type of attachment.  It is a format in which the entire email including attachments are bundled as together.  The client has to be aware of this format to be able to decipher it.  

I don't know exactly what you did to "fix" it, but it apparently has disable the local clients from being able to read it.  Try reading through the article below and see if it helps resolve it.  


http://help.outlook.com/140/gg263346.aspx
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by:tinus67
ID: 39968603
Hi rfportilla,

Thanks for the reply,

The part of the TNEF being the problem for the outgoing mail is something i understand, and i first tested the fix by disabling the TNEF for a few specific domains before disabling it for the default remote domein. So that seems to be ok for now. The problem however is that my own network who are all using outlook clients are suddenly receiving random winmail.dat attachments from outside clients.

For a test i am going to try and re-enable the TNEF for de default remote domain to see if that setting influences the incoming attachments. Normally it shouldn't as it is a setting for the remote domein. not the incoming mail.

Anyway i update my find on that later today, If that does however fix my incoming attachment problem i'm still stuck on the outgoing winmail.dat problem.

Seems to be a lose - lose situation.
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by:rfportilla
ID: 39969282
Please post back. I'd be like to hear an update.
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by:tinus67
ID: 39969295
I'v Changed the TNEFEnabled setting from $False to $null (This lets outlook decide for it self what format to use).

i'v asked people to test as many mails as possible also to let clients resend mails that gave winmail.dat errors.

So far so good but i'v only been testen for a few hours, i'l repost an update later on this week to let you know how were getting on.
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by:tinus67
ID: 40394204
a bit late on the reply but this above fix this resolve the issue
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