MailChimp is an online service that enables marketers to send mass email newsletters, manage lists with subscribers and track how users interact with emails sent (click rate, open rate, unsubscribe rate and more).
Was launched first time in 2001 and has a long tradition in managing and sending e-mails and still remains on of the best services despite competitors such as Aweber or Constant Contact.
Subscribers are rated automatically with stars regarding how often they open and interact with emails. As online marketers, webmasters can send an email to an entire list with one click or select a segment from a list based on rating, location and more.
Includes API, different templates, can be integrated with Google Analytics, supports A/B testing and many other features.
Is free up to 2.000 subscribers and 12.000 emails sent.
Can import or export bulk databases with email addresses.
