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Read 40 Mailgun reviews and testimonials from customers, explore 36 case studies and customer success stories, and watch 2 customer videos to see why companies chose Mailgun as their Email API Software

Mailgun is a developer-focused email delivery platform that empowers companies to send, receive, and track transactional and marketing emails through an API. Founded in 2010, Mailgun became a Y-Combinator success story later acquired by Rackspace. In February 2017, Mailgun spun back out as a standalone business focused on building best-in-class email deliverability solutions. Mailgun enables developers to tightly integrate email into their apps, i.e. give real email mailboxes to their users, their web pages or any objects in their apps. Customers like Slack, Lyft, Github, and Reddit rely on Mailgun to deliver email to their customers.

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  • 40 Testimonials View
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Customer Rating Review Score based on 3530 reference ratings
4.7/5.0 (3530)
  • Winter 2026 Market Leader Transactional Email Software
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40Testimonials

  • "For Us, At The Volume We're Sending – Every Fraction Of A Percentage Means A Potential Customer, And As A Community Of Designers, It's Our Job To Create Meaningful Touchpoints. …

    Michael Sacca Vice President of Product

  • "Mailgun totally abstracts away everything to do with emails. At Parse, we deeply understand the benefits of this, as we ourselves abstract away servers for our customers. Everyday, developers cry …

    Parse

  • "I got onto Mailgun six years ago for our email marketing app. And I’m still sticking with Mailgun because it’s the number one for email marketing. There’s no one else."

    Sam Nguyen Chief Executive Officer
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36 Case Studies

  • When Transactional Email Preps 4 Million Contracts For E-Signature Every Month

    Anthony Sims Marketing Director

  • Building a dynamic email ecosystem SparkToro's story

    Casey Henry Chief Technology Officer

  • How Cinemark utilized Mailgun to streamline their customer service experience

    Joe Dan Galyean Vice President of Application Development, Cinemark
35 more case studies currently locked

2 Customer Videos

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Additional Mailgun Information & Resources

Read Mailgun Reviews, Testimonials & Customer References from 40 real Mailgun customers.

Browse Mailgun Case Studies, Customer Success Stories, & Customer References from 36 businesses that use Mailgun.

Watch Mailgun Customer Videos to learn why 2 businesses chose Mailgun.

FeaturedCustomers has 1,965,098+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.