

Recommended setting for most contacts: Let Outlook decide. Use this to override the setting in Internet options (above). Changes made here apply to all messages sent to this person.

Open the Contact and double click on the email address. Note: this setting is not easily accessible in Outlook 2013 and newer. Outlook 2007 and older: Go to Tools, Options, Email Format, Internet Options button.

Outlook will send all messages to the Internet using HTML unless you change the email properties (below). Outlook 2010, 2013, or Outlook 2016/2019: File, Options, Mail and scroll to the bottom of the dialog. If this is set to plain text or HTML formatting, Voting and Meeting Requests may not work unless you override the setting using Email properties. Use this setting to control how messages created using RTF formatting or that require TNEF encoding are handled.
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See How to clear name from the cache at Understanding Outlook’s Auto-Complete Cache if you need help clearing the autocomplete cache. Delete the address from the cache to clear it or clear the entire auto-complete cache. The auto-complete cache (nickname cache) remembers the setting and Outlook will continue to send messages using RTF. If the administrator disables RTF to Internet addresses, the settings in Outlook will not override them.ĭon't forget to clear the auto-complete cache after changing Outlook's settings. Note: Exchange server administrators can also control RTF to Internet addresses. When RTF is not working as expected (either all messages are RTF, or Meeting Requests and Voting are not working) there are several settings your need to check in Outlook. Where to check for RTF settings in Outlook

