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Posta
Self-hosted email delivery platform
A developer-first alternative to SendGrid and Mailgun. Send emails via HTTP API while Posta manages SMTP delivery, templates, analytics, and security. Full multi-tenant support with workspace isolation.
GoLanguage
Apache-2.0License
Key Features
REST API for transactional, batch & templated emails
Async processing with Redis/Asynq, automatic retries
Versioned, multi-language email templates
Multiple SMTP providers with domain verification
API keys with expiration & IP allowlisting
OAuth/SSO (Google, Keycloak, authentik)
Contact tracking, segmentation & bounce handling
Multi-tenant workspaces with RBAC & 2FA
Get started with Posta
Check out the source code, read the docs, and start building.