Email marketing means you have a growing list of subscribers and you send them email newsletters, promotions and other updates via email. Typically, you would use a service such Constant Contact, Mailchimp, etc., to manage your subscriber list and send your email blasts.
If none of that sounds like something you've done, go ahead and select "no" above.
The best way to send us your list would be in a spreadsheet .CSV format. If you're unsure, just send us whatever you have.
If you currently use Online Ordering or an online reservations service, perhaps you can export a list of customers from there, then send us that list so we can import it to your newsletter list.