You can do a Google search for drag and drop html email builder, and export the html to save as templates in Postmark, but you’ll still need to learn how to include variables in the email. I’d recommend getting a bit familiar with HTML and CSS, as that’ll come in handy anyway, and all emails are html, so being able to build your own HTML emails gives the best branding at essentially no cost. One of the reasons email builders charge what they do is because of the email designer, and people don’t want to learn just a little bit of HTML/CSS, so they pay for a builder tool instead.