Postal
Self-hosted email delivery platform with powerful features for transactional and bulk emails, offering full control and customization.
16,723
MIT
Alternative to: MailerSend
Best Open Source MailerSend Alternatives
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MailerSend7 tools
Open-source tools
Plunk
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
5,347
AGPL-3.0
Alternative to: MailerSend
useSend
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.
4,199
AGPL-3.0
Alternative to: MailerSend
DoubleZero
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.
1,246
AGPL-3.0
Alternative to: MailerSend
Sessy
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
909
Other
Alternative to: MailerSend
Hyvor Relay
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
725
AGPL-3.0
Alternative to: MailerSend
Wraps
Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.
55
Other
Alternative to: MailerSend