It is possible to add font types to the email builder, but we do not recommend it.
Font support for email clients (such as Gmail, Yahoo Mail, Outlook etc.) are not very reliable. There are about 7 fonts that work consistently through the most commonly used email clients.
Any other font will work in 10%-50% of clients, at best. This is why we typically restrict fonts through our application.
Please reach out to [email protected] or through the in-app chat if you have any questions!