Resend vs Postmark vs Mailgun for Solo Developers in 2026

Originally published at devtoolpicks.com SendGrid just killed its permanent free plan. Mailgun doubled its pay-as-you-go rate overnight in December 2025. If you're building a SaaS or shipping a side project right now, you're probably rethinking your transactional email setup. You've got three realistic options that developers actually use in 2026: Resend, Postmark, and Mailgun. I've used all three across different projects. They're not interchangeable. Each one is the right answer for a different stage and a different use case, and picking the wrong one costs you money or costs you delivered emails. Here's my honest take. No affiliate deals with any of them. Quick Verdict Tool Best For Free Tier Starting Price Rating Resend MVPs and React/Next.js apps 3,000 emails/mo $20/mo (50k emails) ⭐⭐⭐⭐⭐ Postmark Mission-critical transactional email 100 emails/mo $15/mo (10k emails) ⭐⭐⭐⭐⭐ Mailgun High volume with advanced routing 100 emails/day $35/mo (50k emails) ⭐⭐⭐⭐ My pick for most solo devs i