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  • 4.8 / 5.0 (1556)
    161+ References
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Read 51 Postmark reviews and testimonials from customers, explore 32 case studies and customer success stories, and watch customer videos to see why companies chose Postmark as their Transactional Email Software

Postmark delivers your transactional email to your customers, on time every time. Your emails are important, get them to the inbox. Trusted by thousands of developers, Postmark is a fast and reliable transactional email service.

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Customer Rating Review Score based on 3554 reference ratings
4.7/5.0 (3554)
  • Winter 2025 Market Leader Transactional Email Software
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51Testimonials

  • "Using Postmark's great documentation and API, we implemented their transactional email system and fixed 99% of our email issues."

    Dean Mathews Founder

  • "These amazing results have been made possible not only thanks to the quality of our leads and our technology, but most importantly thanks to our trusted email deliverability partner: Postmark."

    Aurélien Tert Chief Executive Officer

  • "Been a Postmark customer for a very long time. Stability and deliverability is so good I sometimes go months without thinking about it. It just works."

    Ben Webster Co-Founder
50 more testimonials currently locked

32 Case Studies

  • BillQ - Customer Case Study

    Zack Gilbert Lead developer

  • Nusii trusts Postmark to power the connection with their customers

    Michael Koper Founder

  • OnTheClock fixes 99% of their email issues by switching to Postmark

    Dean Mathews Founder
31 more case studies currently locked

Additional Postmark Information & Resources

Read Postmark Reviews, Testimonials & Customer References from 51 real Postmark customers.

Browse Postmark Case Studies, Customer Success Stories, & Customer References from 32 businesses that use Postmark.

FeaturedCustomers has 1,903,258+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.