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Disable RTF / TNEF message format in Microsoft Outlook

Last Updated: Dec 03, 2013 12:09PM GMT
If you are using Microsoft Outlook or Microsoft Exchange then your messages may be set to use Rich Text Format (RTF). RTF (or more correctly TNEF) is an old proprietary Microsoft standard that is not understood by the majority of email clients and is rarely used any more. It has been replaced by the HTML format. 

While mkryptor (version 2.1+) does include handling for TNEF, it is still recommended to avoid sending messages in this format if possible.
Note: If you are using Microsoft Exchange, message format settings are made at the server level. See the relevant Exchange Set-up Guide for details
Further information on the downside of using TNEF can be found in the following Microsoft Support Article: http://support.microsoft.com/kb/290809

To configure Outlook to use HTML format for messages, follow the below steps:

  • In Outlook, go to Tools -> Options
  • In the Options window, select the 'Mail Format' tab
  • In the drop-down for 'Compose in this message format' select HTML
  • Now click the 'Internet Format...' button
  • This will open a new window with some important options
  • In the Internet Format window, find the section titled 'Outlook Rich Text options'
  • In the drop-down box, select 'Convert to HTML format'
  • Click OK to save changes and also click OK on the main Options window
  • Your messages should now go out in HTML format

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