This feature can be very helpful in distinguishing a test email in the inbox. For example, you define the phrase "TEST ONLY!" in the settings. Now, if you send a test email campaign to yourself with the subject line "Monthly Revenue Report", you will receive the email with the subject line - "TEST ONLY! Monthly Revenue Report".Steps to set up a default phrase for all your test campaigns' subject lines: Click your username on the top-right corner of your application, then from the drop-down menu, select Settings.On the Settings page, in the Campaigns section, click Test Campaign Subject Line. On the Test Campaign Subject Line page, enable the 'Include Custom Email Subject Line in all Test Campaigns' check box. Then, enter the phrase that you want to set up for your test email subject line. Click SAVE CHANGES.
