What is Email Marketing? Email marketing is the act of sending a commercial message , typically to a group of people, using email . In its broadest sense, every email sent to a potential or current customer could be considered email marketing . It usually involves using email to send advertisements , request business, or solicit sales or donations, and is meant to build loyalty , trust, or brand awareness . Marketing emails can be sent to a purchased lead list or a current customer database. The term usually refers to sending email messages with the purpose of enhancing a merchant's relationship with current or previous customers, encouraging customer loyalty and repeat business, acquiring new customers or convincing current customers to purchase something immediately, and sharing third-party ads.