|Headquarters||Ponce City Market, Atlanta, Georgia, U.S.|
|Ben Chestnut (CEO)|
Number of employees
|Parent||The Rocket Science Group LLC.|
Mailchimp (capitalized as MailChimp until 2018) is an American marketing automation platform and an email marketing service. The platform is a trading name of its operator, Rocket Science Group, an American company founded in 2001 by Ben Chestnut and Mark Armstrong, with Dan Kurzius joining at a later date. Mailchimp began as a paid service and added a freemium option in 2009. Within a year, its user base had grown from 85,000 to 450,000. By June 2014, it was sending over 10 billion emails per month on behalf of its users. In 2017, the company was gaining 14,000 new customers every day. The company is still owned by its co-founders and has never accepted venture capital funds.
In 2016, Mailchimp was ranked No. 7 on the Forbes Cloud 100 list. In February 2017, the company was named one of Fast Company's Most Innovative Companies of 2017. In August 2017, It was reported that Mailchimp would be opening offices in Brooklyn and in Oakland, California.
In February 2019, Mailchimp acquired LemonStand, a smaller competitor. Later in 2019 the company announced its annual revenue would reach $700 million. Mailchimp is going to become a full marketing platform aimed at smaller organizations.
As of May 2019, new users will be charged per contact as opposed to just subscribed contacts, so new users will be paying for unsubscribed contacts and those who have not yet confirmed. 
As a podcast advertiser, Mailchimp also sponsored the launch of Serial, a podcast exploring a murder case over multiple episodes. During the series parodies of Serial have targeted several of the show's aspects, including the podcast's sponsor (especially the meme "MailKimp").
In February 2016, Mailchimp announced it was merging Mandrill transactional email service into Mailchimp as an add-on feature, and gave customers 60 days' notice to switch to the new pricing structure or find an alternative service platform. The announcement was met with widespread criticism and customer outrage due to the new pricing structure requiring a paid Mailchimp plan before being able to purchase Mandrill credits, resulting in customers paying for two products in order to access Mandrill.
Previously, customers were able to purchase Mandrill credits for sending emails without signing up on Mailchimp. The credits were originally priced at $9.95 for 25,000 emails but increased to $20 for the same number of emails under the new pricing scheme. In addition to needing to purchase Mandrill credits, customers now need to be on a paid Mailchimp monthly plan (the minimum monthly plan being $10 a month), even if the customer has no need for Mailchimp services and only wants access to Mandrill. Mandrill was renamed Mailchimp Transactional.
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- Roe, Mike (November 8, 2014). "Serial: The hottest podcast with the most spot-on parodies". 89.3KPCC. Retrieved November 12, 2014.
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- Williams, Owen (2016-02-25). "In hostile move, Mandrill gives all developers 60 days to switch to paid Mailchimp service". The Next Web.
- Nicastro, Dom (2016-02-26). "MailChimp's Mandrill Move Enrages Email Users". CMSWire.
- MailChimp (2016-02-24). "Important Changes to Mandrill". Mandrill Email Platform Blog.