Promotional emails are one of the best marketing tools a small business has at their finger tips. The Vatora systems allows you to create and send emails to every customer who has an email on a waiver. You can choose filters and send to specific age groups, or send emails based on when the customer visited last, how many times they have been to your facility, etc.
With an easy to use editor, you can create simple emails complete with included graphics. Or if familiar with html, you can hand code the entire email if you prefer. Send yourself a sample to assure it looks perfect, then run a count of how many will go out based on your filters.
There is a small fee for sending blast emails, but the cost is a fraction of other bulk email services like mailchimp or constant contact.