Mailchimp has a free plan as well as three contact-based pricing plans, which, to be honest, is somewhat confusing. You pay based on the number of contacts you have, including subscribers, unsubscribers, and nonsubscribers. While a cap on contacts is customary, Mailchimp also caps the number of emails you send, which is both unusual and costly in the long run. With this kind of pricing system, you’ll have to pay much more than you would with other email marketing services.