TagExternal flow for Office 365

Purpose

Exchange online allows you to mark external messages using a transport rule. The common way to do it is to prepend a Subject line or a message text with a warning string like
"[EXTERNAL] this email originated outside the organization".
This method has at least 2 disadvantages:

• The Outlook preview shows the warning message for each external email rather than the first line of the message like they are used to.

  

• A back and forth email conversation would have the warning prepended multiple times.

  

You can place the variable %%From%% to the warning string. It will be replaced by the envelope address of the sender:

Installation

1. Download tagexternalflow3.zip file and then run Office 365 PowerAutomate and import the zip file to your flows list as described here.

2. Modify warning message in the action "[PARAMETER] Initialize variable WarningString".

3. Modify the list of internal domains in the action "[PARAMETER] Initialize variable InternalDomains".

   

4. Enable TagExternal flow.

Testing

Open Outlook and check if the message is marked as external.

F.A.Q.

Q. Is there a way to change the color of the category?
A. Yes, just create your own colored category as described here. If you wish to use a company-wide category, try to use this freeware tool: CatMan.



This application is a freeware.

Please understand that we do not provide technical support for our freeware products.



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