You can learn more about GDPR at their official site.
2. HOW FEATURE.FM MANAGES CONSENT
GDPR requires fans in the EU to explicitly opt in to receive email messages from Feature.fm's clients who are the Data Controllers. After a fan takes an action that may collect their email address, they are presented with an option to opt in to receive future marketing emails.
Feature.fm will not collect the email or names of fans who do not opt in.
Viewing and protecting fan email addresses
To view your list of fan email addresses in your Feature.fm dashboard, Feature.fm is implementing a 2-Factor Authentication log in process that verifies your identity to protect fan data.
When you view your list of emails in your campaign or audience tab, you'll notice that there are some users that are listed anonymously. These are fans who did not opt in to receive emails.
Feature.fm customers are allowed to email fans who have opted in. Any email addresses that you are able to view are from fans who opted in. If a fan later opts-out, then their email address will updated to be anonymous.