Though it is one of the older digital marketing strategies, email marketing is still around because it works. Businesses use this versatile platform to generate and nurture leads, strengthen client relationships, build their audience, and obtain more customers. So how do they get these email addresses in the first place? They ask. Placing call-to-action phrases and buttons on your website and other forms of content is a great way to collect email addresses to build your email list. Below are 20 real examples of email signup calls to action that help to illustrate call-to-action best practices.