Emails as a crucial part of the customer journey? Well-known puzzle, especially for all of us working on B2C projects, e.g., in the e-commerce or travel sector. We'd been working on such features, and what always puzzled me how much time we spent making sure we aren't introducing any regression repeatedly. We can send an incorrect email only once.
Fortunately, we realized emails today are nothing but an HTML page. And Cypress excels in that.