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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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4.7/5.0 (3502)
  • Market Leader 2025 2025
    Winter 2025Market LeaderTransactional Email Software
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51Testimonials

  • "Easy to set up. Great API. Rapid mail delivery and no spam issues. We moved from Mandrill because of terrible deliverability and am pleased to say it’s been well worthwhile we’ve even saved money. Thanks Postmark Team.you rock!"

    Ben JemisonGeneral Manager
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32 Case Studies

  • With Postmark, Eternia powers not only its own emails, but its clients' as well

    Justin MayfieldOwner
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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 1,890,269+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.