How To Apply Subject For External Mails

In this article, we are going to see how to add a subject for external emails. When I say this, you will have one question - why should we add the Subject for External Mails specifically. Right?

There are a lot of ways spammers are targeting users by using the email address policies which look genuine in nature but are not. We can apply a subject to the External mails using the following procedure, which will give an extra warning for the internal recipients.

Open Exchange Admin Center.



Click on "Create a new rule".



Type the name for "Transport Rule" and click on "More Options".



Select Apply this rule if –> The Sender –> is External/Internal.



Select "Outside the Organization".



Select Do the following–> Prepend the subject of the message with...



Type the text that you want to display in the mails for the internal recipients.





We need to exclude signed mails which are sent from external because the digitally signed mails should not get intercepted.

To do that, select Except if –> The Message type is –> Signed.



Once selected, save the rule and wait for 15 to 20 minutes for the rule to get replicated between the Exchange Servers.



Check any mail coming from the external domains now.



You can see that the Subject is added with the additional text which was applied through the transport rule.