MailChimp has long been the go-to service for businesses on a budget. With up to 2,000 contacts and 12,000 e-mails sent per month, their Forever Free plan is nearly unrivalled in the industry. They’ve also got the most intuitive, user-friendly interface of the lot, having been designed with simplicity in mind. Even if you’ve never used an e-mail marketing service before, MailChimp’s learning curve is relatively accessible for a beginner. On top of that, they’ve got advanced marketing automation tools, superior third-party integrations, and A/B testing features.