Best Self-Hosted Mailgun Alternatives in 2026
Mailgun is a transactional email API service for developers with email sending, receiving, and validation.
7 Self-Hosted Alternatives to Mailgun
Postal
16KA fully featured open source mail delivery platform for incoming & outgoing e-mail
Billion Mail
14KReleased under AGPL-3.0, Billion Mail provides email marketing platform on self-hosted infrastructure.
Plunk
4.9KPlunk is a self-hosted email & newsletters replacement for Mailchimp, Mailgun, and more.
useSend
4.1KUseSend handles email platform for transactional and marketing emails. Self-host or use cloud service as a self-hosted solution.
Sendune
2.1KSendune is a self-hosted automation & workflow tool that provides comprehensive platform for managing transactional and marketing emails through AWS SES.
DoubleZero
1.2KDoubleZero is a Elixir-based application that provides 00 is an email API and infrastructure solution.
Hyvor Relay
549Hyvor Relay is a self-hosted email servers tool that provides email API alternative to AWS SES & Mailgun. AGPL-3.0.
Why Look for Mailgun Alternatives?
Mailgun is a transactional email API service for developers with email sending, receiving, and validation.
Self-hosted alternatives give you full data ownership, predictable costs, and zero vendor lock-in. You run the software on your own infrastructure and control everything.
7 Best Open-Source Alternatives to Mailgun
Billion Mail
Self-hosted email marketing platform with unlimited sending, AI-powered email creation, real-time analytics, and no monthly fees. Complete SMTP solution. — 13,683 GitHub stars. Licensed under AGPL-3.0.
Postal
Fully featured mail delivery platform. — 16,398 GitHub stars. Licensed under MIT.
Plunk
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes. — 4,912 GitHub stars. Licensed under AGPL-3.0.
useSend
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent. — 4,051 GitHub stars. Licensed under AGPL-3.0.
Sendune
A comprehensive platform for managing transactional and marketing emails through AWS SES, featuring customer data management, SMS capabilities, and workflow automation. — 2,094 GitHub stars. Licensed under MIT.
Hyvor Relay
E-mail API for developers — 545 GitHub stars. Licensed under AGPL-3.0.
DoubleZero
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack. — 1,243 GitHub stars. Licensed under AGPL-3.0.
Why Self-Host Instead of Mailgun?
- Data ownership. Your data stays on your server, not on Mailgun’s infrastructure.
- Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- No vendor lock-in. Export and migrate your data anytime. You control the database.
- GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
Why teams switch from Mailgun
- → Data ownership. Your data stays on your server -- not on Mailgun's infrastructure.
- → Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- → No vendor lock-in. Export and migrate your data anytime. You control the database.
- → GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
Browse more Email & Newsletters tools
Explore 73 open-source email & newsletters tools you can self-host.
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