Opt-in email advertising, or permission marketing, is a method of advertising via email whereby the recipient of the advertisement has consented to receive it. This method is one of several developed by marketers to eliminate the disadvantages of email marketing.
Opt-in email marketing may evolve into a technology that uses a handshake protocol between the sender and receiver. This system is intended to eventually result in a high degree of satisfaction between consumers and marketers. If opt-in email advertising is used, the material that is emailed to consumers will be "anticipated". It is assumed that the consumer wants to receive it, which makes it unlike unsolicited advertisements sent to the consumer. Ideally, opt-in email advertisements will be more personal and relevant to the consumer than untargeted advertisements.
A common example of permission marketing is a newsletter sent to an advertising firm's customers. Such newsletters inform customers of upcoming events or promotions, or new products. In this type of advertising, a company that wants to send a newsletter to their customers may ask them at the point of purchase if they would like to receive the newsletter.
With a foundation of opted-in contact information stored in their database, marketers can send out promotional materials automatically—known as Drip Marketing. They can also segment their promotions to specific market segments.