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Mailgun

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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
  • 36 Case Studies View
  • 2 Customer Videos View
Customer Rating Review Score based on 3637 reference ratings
4.7/5.0 (3637)
  • Winter 2026 Market Leader Transactional Email Software

40Testimonials

  • "People who post want an answer quickly, and we use Mailgun to make sure that suggestions, ideas, and conversations are emailed to interested users promptly and reliably. The Mailgun API …

  • "Mailgun allows us to do efficient customer service and notification emails to our user base with its SMTP and rate limiting support. We no longer have the nagging worry that …

  • “It seemed like all ESPs were offering similar services, and the magic was hidden in the details. One of the details that was really important to us was deliverability. How …

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36 Case Studies

  • How Dribbble Improved Connection & Scalable Sending With Mailgun

  • How DevBranch Started Growing Digital Storefronts with Mailgun and Drupal

  • How Geogram Built A Free Group Email Service Using Yii For PHP …

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.