The average office workers receives 121 emails a day. Globally, 269 billion emails are sent on a daily basis.

While it's easy to send a quick message to your friends and family, many emails require a delicate balance of art and science, commonly referred to as email marketing.

Email marketing is a type of direct marketing that uses email marketing campaigns as the main communication channel to reach an audience. In its broadest sense, any email you send to a potential or current customer could be considered email marketing. However, the most common definition refers to using email to reach a group of people to achieve a specific goal, whether that be increasing leads, sales, retention, or engagement.