My fonts are not displaying the way I want them to in Apple Mail. Why?

Unfortunately, the way an email is processed and displayed varies between email clients. This means that your email may be viewed in various ways by different subscribers, based on their email service provider (ESP). To ensure recipients using Apple Mail see your font correctly, you will need to modify the coding of your email. Attention: Advanced knowledge of HTML required. Unwanted changes may occur to your campaign if the HTML