You can add participants automatically to your Mailjet lists using the native Mailjet integration. You can either set it up for your organization (all projects that don't have individual integration settings) or on a project level.
Make sure you have a dedicated opt-in checkbox in your brandquiz project and it is set to "Sends data to: Mailjet (or all integrations)".
Your integration will send email, first name and last name automatically.
Be aware that double opt-in is activated by default and each new subscriber will receive a confirmation email.
If you have any troubles setting up this integration, please contact us.