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.

Microsoft 365

Click on "Create a new rule".

Microsoft 365

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

Microsoft 365

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

Microsoft 365

Select "Outside the Organization".

Microsoft 365

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

Microsoft 365

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

Microsoft 365

Microsoft 365

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.

Microsoft 365

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

Microsoft 365

Check any mail coming from the external domains now.

Microsoft 365

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