I’ve released a small tutorial on How to Stop Spam Emails in Ghost using Zapier and MailChimp. If you are interested you can give it a shot. It is more like a filter to find what emails are spam. Long story short, I’m creating a MailChimp list with a Subscribed Url field, mandatory. Then I create a Zap that says “When a New Ghost Subscribed is inserted, add it to MailChimp list, only if the Subscribed Url field in not empty”.