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Read 40 Mailgun reviews and testimonials from customers, explore 30 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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Customer Rating Review Score based on 3415 reference ratings
4.7/5.0 (3415)
  • Winter 2026 Market Leader Transactional Email Software
    Press Release Report

40Testimonials

  • "We use Mailgun Routes to update our internal dashboard and status site from alert emails from Pingdom. Our experience has been great. Easy to setup and the service has been …

    37Signals

  • "We used to use WordPress SMTP plugins to increase deliverability for the emails sent from our clients’ WordPress websites. These were very error-prone because there were still some deliverability issues …

    Barn2 Media

  • "In fact, we immediately saw improved attribution because of how Iterable applies link tagging to dynamic links, which helped us understand the full impact of the email program."

    Andrew Harner Lead Manager
39 more testimonials currently locked

30 Case Studies

  • Mailgun + Dovetail, A Recipe For Rapid Growth

    Nick Frandsen Co-Founder and Managing Partner

  • How Tealeaf Academy Increased Student Engagement 3x

    Kevin Wang Chief Instructor

  • How Userfox Sends & Tracks Emails In Their Ruby App Using The …

    Peter Clark CEO
29 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 30 businesses that use Mailgun.

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

FeaturedCustomers has 1,908,818+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.