Email Marketing is the process of building email campaigns using lists of target email addresses, then creating and sending customized email messages to a defined audience for the purpose of creating awareness, promoting, or driving sales of a product or service.
Aside from hiring an email marketing agency, a business can do the work in-house using email marketing platforms such as Constant Contact and Mail Chimp. A top reason to hire an email marketing service is to avoid violating federal laws on email marketing, most notably the CAN-SPAM ACT which empowers the government to fine violators up to $43,792 for non-compliance.