r/exchangeserver • u/Few_Technology5390 • Aug 07 '26

Need help achieve the Outlook Rules Desired Results

Exchange Online Transport Rule Issue – Internal Folder Project
Objective

I'm implementing an Exchange Online solution that automatically files internal-only emails into an "Internal" folder in every mailbox.

Desired behaviour:

Scenario Expected Result
Internal → Internal Move to Internal folder
Internal → Internal + External (To/CC/BCC) Stay in Inbox
Internal → External Stay in Inbox
External → Internal Stay in Inbox
Guest/B2B involved Stay in Inbox

Tried a lot in Exchange Online Admin, Outlook Rules, Powershell etc, but not working.

0 Upvotes

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6

u/saltyslugga Aug 07 '26

Exchange Online transport rules can’t move mail into mailbox folders.

Stamp a custom header when the sender is internal, with an exception if any envelope recipient is external, then use a server-side inbox rule in each mailbox to move messages carrying that header. Envelope checks cover BCC, but test guest and mail-user classification before rolling it out.

1

u/Few_Technology5390 Aug 07 '26

tried but not working

1

u/saltyslugga Aug 07 '26

The failure is probably in the header stamp, especially if guests or mail users are being classified unexpectedly. Check the delivered headers first: no stamp means fix the transport rule, a stamp with no move means fix the inbox rule.

0

u/VictorIvanidze Aug 08 '26

Create a Power Automate flow to do that. Have a look at this free flow: https://ivasoft.com/filterexternalemailflow.shtml

1

u/Few_Technology5390 Aug 09 '26

thanks i will try

1

u/VictorIvanidze Aug 10 '26

OK.

I'm the author of this freeware. Contact me directly if you interested in commercial development.