Mailchimp
Overview
An email marketing service for building mailing lists, designing newsletters, and sending them to subscribers.
General use
Businesses use it to send newsletters and promotions, set up automatic welcome and follow up emails, and see open and click rates.
Insight
Fine for basic newsletters and simple automated emails, and familiar to most people. It has grown pricier and more cluttered over the years, and it charges you for contacts who never open anything unless you prune the list yourself. Serious senders often outgrow it and move to a cheaper, more focused tool. Best for small lists and straightforward sending.