Due to the limitations of most email servers, at present, DentalPlus is not designed to send out mass-mailings (thousands of patient). The best solution is to export your patient email addresses to a system like MailChimp which is designed for marketing mailings. With mailchimp, you can send to 2,000 patients for free, and more for a small cost.
1. First create an account on mailchimp.com
2. View this video on exporting the email address and importing them into mailchimp