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.
Australia
The open source mail server - Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers.
Cuttlefish offers basic bounce email handling, ensuring you maintain your good mail reputation by not resending to bounced addresses.
Open source email marketing platform with a visual MJML editor, automations, transactional API and cookieless web analytics. Self-host it and bring your own email provider.
France
EU
Reloop gives you the same capabilities as SendGrid, Mailchimp, Resend, and Loops — but the codebase is open source and fully self-hostable.
India
Germany
