Best Open Source Alternatives to MailerSend

Compare the best free and open-source alternatives to MailerSend — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated November 2026 · 6 alternatives

MailerSend

Proprietary SaaS

MailerSend alternatives compared

Open-source alternatives to MailerSend, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Plunk	5,573	AGPL-3.0	Web	No	Nov 2026	Visit
useSend	4,778	AGPL-3.0	DockerLinux	Yes	Oct 2026	Visit
DoubleZero	1,246	AGPL-3.0	DockerLinux	Yes	Oct 2024	Visit
Sessy	946	—	DockerLinux	Yes	Oct 2026	Visit
Hyvor Relay	919	AGPL-3.0	DockerLinux	Yes	Nov 2026	Visit
Wraps	66	—		No	Nov 2026	Visit

Top open-source MailerSend alternatives

Plunk5,573AGPL-3.0

Plunk is an open-source email platform replacing Resend and Mailchimp with zero contact fees, automated workflows, and self-hosted Amazon SES delivery.

Web

vs MailerSend: a free, open-source option you fully control, licensed AGPL-3.0.

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useSend4,778AGPL-3.0

Open-source email delivery platform pairing a Next.js dashboard with Amazon SES to send transactional and marketing messages without per-contact fees.

DockerLinux

vs MailerSend: a free, open-source option you fully control, licensed AGPL-3.0.

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DoubleZero1,246AGPL-3.0

DoubleZero is a self-hosted transactional email API and dashboard for Amazon SES that replaces Resend with local data ownership and markdown support.

DockerLinux

vs MailerSend: a free, open-source option you fully control, licensed AGPL-3.0.

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Sessy946

Sessy replaces third-party email tracking wrappers with a self-hosted AWS SES delivery dashboard and built-in MCP server for AI coding agents.

DockerLinux

vs MailerSend: a free, open-source option you fully control.

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Hyvor Relay919AGPL-3.0

Hyvor Relay is an open-source, self-hosted email API and SMTP server replacing Resend and SendGrid with automated DNS, deliverability queues, and metrics.

DockerLinux

vs MailerSend: a free, open-source option you fully control, licensed AGPL-3.0.

Visit Details

Best Open Source Alternatives to MailerSend

MailerSend

MailerSend alternatives compared

Top open-source MailerSend alternatives

The modern standard for Protobuf workflows

Mentoring for backend developers. Consulting for startups.

More alternatives to MailerSend

Wraps