Open Source Email Platforms using CSS
A curated collection of the best open source platforms for hosting your own email sending infrastructure. using CSS.
The open-source, affordable email platform
Stars
5,379Last commit
3 days agoLicense
AGPL-3.0
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
Open Source Alternative to:
Open-source email marketing for the privacy-conscious
Stars
2,190Last commit
2 days agoLicense
AGPL-3.0
Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.
Open Source Alternative to:
Open-source email API with enterprise deliverability
Stars
862Last commit
15 hours agoLicense
AGPL-3.0
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
Open Source Alternative to:
Self-hosted email infrastructure for developers
Stars
1,248Last commit
2 years agoLicense
AGPL-3.0
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.
Open Source Alternative to:
InfluxDB – The purpose-built time series platform for high-velocity ingestion and real-time queries at scale.
InfluxDB