Forum Discussion
Outlook Search Folder for External Senders
According to Diane_Poremsky_MVP's post, you should be able to achieve this by filtering on "@": https://www.slipstick.com/outlook/rules/filter-internal-mail-from-external-mail/
This involves creating a rule which Schocko nor I want to do. We want to be able to sort by external only OR create a search folder by external only. I have been searching the web for the past day or so and have found nothing.
- Jun 03, 2025
You can basically do the reverse of this;
Search Folder or Conditional Formatting for internal company emails - Robert 365Instead of specifying the From field on the Messages tab, select the field on the Advanced tab so that you can use the "does not contain" condition.
This will filter out the internal emails, thus what is left will be the external emails 😉
Depending on how you've configured your email routing between on-prem, cloud and other mailing instances that you are using, you could also filter based on several message headers. You may need to find out first which will apply to your organization (one or more could apply);
- X-MS-Exchange-Organization-AuthAs: Anonymous
- X-MS-Exchange-CrossTenant-AuthAs: Anonymous
- X-MS-Exchange-CrossTenant-FromEntityHeader: Internet
Internal messages would have AuthAs values of "Internal" and FromEntityHeader of "HybridOnPrem" or "Hosted".
Note that this only applies to Classic Outlook. New Outlook and Outlook on the Web will get more advanced Search Folder support (on a not yet determined date) in the future.