Winmail.dat als bijlage in Outlook


Sommige mails met bijlage(n) worden ontvangen als winmail.dat ipv de bijlage(n).



1) verzonden mail is in RTF opmaak en ontvanger gebruikt GEEN outlook

2) zowel verzender als ontvanger gebruiken outlook en/of geen RFT opmaak



1) de verzender dient de mails in TXT of HTML formaat te verzenden

2) the Exchange administrator can configure Remote Domain transports for the domains that don’t use Outlook and set them to never use RTF to get around the problem. To change the settings on Exchange server, open the Exchange Management Console, expand Organizational Configuration, Hub Transport, Remote Domains, open default transport (or the transport you want to change, if you have more than one) and change the Rich Text setting.


If all else fails…

If nothing seems to be working and you use Outlook 2007 SP2 or Outlook 2010 or 2013, you can use a registry value to end TNEF encoding once and for all. This will affect your ability to use features that require TNEF encoding, including Voting and Meeting Requests in native Outlook format. (Ready-to-use .reg files are available below.)

  1. Close Outlook
  2. Start Registry Editor (type regedit in the Start Search box or Start menu, Run command and press Enter)
  3. Locate the following registry key:

    In Outlook 2007:

    In Outlook 2010:

    In Outlook 2013:

  4. Add a new DWORD named DisableTNEF.
  5. Double click on DisableTNEF and in the Value data box, type 1
  6. Close the Registry editor and Restart Outlook
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