25 Apr 17 7:34 pm
Alan, there are quite a few of them out there that are good. If you're using it for Ecommerce like on a Shopify Store I would say Mailchimp. If you're doing a Blog I would say ConvertKit. If you're asking in terms of promotion i would say ClickFunnels has a great affiliate program where they pay recurring commission as long as the client you referred is a paying ClickFunnels customer.