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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 Scorebased on 3321 reference ratings
4.7/5.0 (3321)
  • Market Leader 2025 2025
    Winter 2025Market LeaderTransactional Email Software
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51Testimonials

  • "I came from Mailgun and left because too many emails went missing. Now, my email shows up instantly for people and the amount of time I save on support requests is worth it. A+ quality service."

    Chris LeippiFounder
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32 Case Studies

  • UnEmplacement trusts Postmark to be their email delivery experts

    Aurélien TertChief Executive Officer
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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 1,840,743+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.