9 Best Open Source Mailgun Alternatives
A curated collection of the 9 best open source and self-hosted alternatives to Mailgun in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Mailgun in 2026? The top open-source alternative is Billion Mail — Self-hosted email marketing platform with unlimited sending, AI-powered email creation, real-time analytics, and no monthly fees. Complete SMTP solution..
Other highly rated open-source Mailgun alternatives include Plunk, useSend and Sendune.
Self-hosted email marketing platform with unlimited sending, AI-powered email creation, real-time analytics, and no monthly fees. Complete SMTP solution.
Self-hosted email marketing platform with unlimited sending, AI-powered email creation, real-time analytics, and no monthly fees. Complete SMTP solution.
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.
A comprehensive platform for managing transactional and marketing emails through AWS SES, featuring customer data management, SMS capabilities, and workflow automation.
A comprehensive platform for managing transactional and marketing emails through AWS SES, featuring customer data management, SMS capabilities, and workflow automation.
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.
Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.
Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.
Email inbox API for AI agents to create, send, and receive messages via REST
AgentMail provides AI agents with real email inboxes, enabling them to create, send, receive, and search messages entirely via REST API. Built specifically for autonomous agents and agentic workflows, it eliminates the need for manual email handling. - Inboxes API: Create, manage, and operate email inboxes entirely via API with custom domains and multi-tenancy support - Threads & Replies: Full email thread management including attachments and realtime events - Semantic Search: Advanced search capabilities to find relevant emails quickly - Data Extraction: Automatically extract structured data from emails - SDKs & MCP: Python, TypeScript, and CLI SDKs with Model Context Protocol (MCP) support - Agent Integrations: Native support for popular AI agents like Claude Code, Hermes, OpenClaw, Codex, Cursor, and Grok - Security: Agent Armor feature to screen inbound mail before agents process it - Scalability: Built for enterprise-grade performance with global infrastructure AgentMail is a fully managed cloud service with no self-hosting option available. The platform provides REST APIs, SDKs (Python, TypeScript, CLI), and MCP servers for seamless integration with AI agent frameworks. All infrastructure is managed by AgentMail with enterprise-grade security and compliance standards.
About Mailgun
Mailgun provides developers with powerful email APIs and infrastructure to send, receive, and track transactional and marketing emails at scale.