MailChimp is an email marketing service and the trading name of its operator, a United States company, founded in 2001. By June 2014 it was sending over 10 billion emails per month on behalf of its users.
MailChimp began as a paid service and added a freemium option eight years later. It was originally going to be called ChimpMail, but the name was changed after the company discovered that they could not get that domain name.
The company's logo is a chimpanzee, and the site includes numerous chimp-related graphics and humor on its website and in its communications.
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"). MailChimp's role as a sponsor made it into a spoof of the podcast during an episode from Saturday Night Live.