Emails play a major role in a company's marketing initiatives. They even play an important role in UI/UX design and website design via notifications. And coding out an email is rarely as easy as many assume.
The multitude of email clients means they all interpret HTML and CSS in their own way. What works in one email client, may not work in another. I started my career with an internship designing and building emails for VistPrint. It was here that I was exposed to the importance of best practices and designing and coding bullet-proof emails.