To make sure your personalization is working as you expect, you can send yourself a test email using real data, to see how your personalization will display

You can preview your campaign at various stages before launching, the 'open preview' button is available when editing HTML or text as well as on the Campaign Overview page.

Previews of your email will automatically use default values instead of real contact data, you can change this to real data using the additional functionality at the top of the preview screen. The 'Select Contact' button will allow you to choose the contact whose data you wish to enter into the campaign preview. This will display the content exactly as the chosen contact will view it.

You can repeat this process as many times as you like for different contacts. This can be useful if your email contains personalization or conditional content, to see how the email display could vary.