Plunk

Plunk is an open-source email platform that strips away the complexity and expense of traditional email services. Built on AWS SES and licensed under AGPL-3.0, it's designed for developers and indie hackers who value transparency and cost efficiency. The platform handles transactional emails, marketing campaigns, and automations—all in one place with usage-based pricing that makes sense: you pay only $0.001 per email sent.\n\nWhat sets Plunk apart is its radical simplicity: no hidden fees, no contact-based pricing that punishes growth, and the option to self-host for complete control. The free tier (3,000 emails/month) is genuinely free forever. For an indie hacker sending 10,000 emails monthly, Plunk costs $10. SendGrid would cost $20. Mailchimp would cost even more. The platform includes workflow automation, segmentation, and detailed analytics—everything you need without the enterprise bloat.