The best open source alternative to Mailgun is useSend. If that doesn't suit you, our users have ranked more than 50 alternatives to Mailgun and six of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Mailgun are Postal, Mailwhale, Cuttlefish.io and Notifuse.
Open-source email platform for transactional, marketing, and product messaging via REST API, SMTP relay, or SDKs, featuring campaign editor, list and domain management, analytics, webhooks, template support, suppression lists, and flexible hosting options.
Cuttlefish offers basic bounce email handling, ensuring you maintain your good mail reputation by not resending to bounced addresses.
Modern, self-hosted emailing platform that allows you to send newsletters and transactional emails at a fraction of the cost. Built with Go and React, it provides enterprise-grade features with the flexibility of open-source software.
Reloop gives you the same capabilities as SendGrid, Mailchimp, Resend, and Loops — but the codebase is open source and fully self-hostable.
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