Creating a mailing list can be a great way to keep your customers engaged with your auction company. There are a few things you need to be aware of when it comes to creating and sending customer emails:
1. Bidders must explicitly subscribe to your list in order for you to send them emails. An explicit sign-up can be written or electronic. If a bidder wins an item on your auction, you are not able to add them to your email list as they did not explicitly sign up to receive them.
2. All promotional emails sent on your behalf must be CAN-SPAM compliant. To see more information on CAN-SPAM compliance click here.
There are plenty of great options for sending emails (MailChimp, Constant Contact) that will help you build a list and maintain CAN-SPAM compliance.
An easier alternative to maintaining and sending email would be to direct interested parties to follow you on Facebook and post regularly when you have new auctions. In order to make sure they see your posts, you can have them select the "See First" option underneath your "Followers" options.