Ensure GDPR compliance by default (Article 25 GDPR – privacy by design and by default). Under GDPR, consent must be freely given, specific, informed and unambiguous [1]. We were subscribing users without explicity consent, which goes against the "No pre-ticked boxes" principle. For compatibility with existing installations, we're using a setting, disabled by default. Once we release version 2.4.0 we will enable it by default, which won't affect existing installations but only new ones. [1] https://gdprinfo.eu/best-gdpr-newsletter-consent-examples-a-complete-guide-to-compliant-email-marketing