1. From the event's dashboard, click on "Promotions" from the sidebar 2. Click on the mailer which is set to send the "Registered attendees" 3. Click "Activate Mailer" on the top right 4. On the pop up click on "Send it now" Related ArticlesHow to create reminder mailers that can be sent to registered attendees?How to send Promotional Mailers via EmailHow to send registration confirmation mailer to attendees who have already registered?How to send Promotional Mailers via EmailHow to send a test mailer?