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Open source alternatives to SendGrid[012]

SendGrid provides transactional and marketing email delivery over an API and SMTP, with templates, analytics and deliverability tooling. Below are 12 self-hostable open source alternatives, ranked by GitHub popularity.

// COMMUNICATION№ 001
Listmonk

Listmonk

GO

High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

★ STARS

20.0k

⑂ FORKS

2.0k

OPEN PROJECT→
// COMMUNICATION№ 002
Mautic

Mautic

PHP

Open Source Marketing Automation Software.

★ STARS

9.6k

⑂ FORKS

3.3k

OPEN PROJECT→
// COMMUNICATION№ 003
Plunk

Plunk

TYPESCRIPT

The Open-Source Email Platform

★ STARS

5.0k

⑂ FORKS

341

OPEN PROJECT→
// DEVOPS№ 004
useSend

useSend

TYPESCRIPT

Open source alternative to Resend, Sendgrid, Postmark etc.

★ STARS

4.2k

⑂ FORKS

373

OPEN PROJECT→
// COMMUNICATION№ 005
Sendportal

Sendportal

PHP

Open-source self-hosted email marketing. Manage your own newsletters at a fraction of the cost.

★ STARS

2.1k

⑂ FORKS

459

OPEN PROJECT→
// COMMUNICATION№ 006
Sendune

Sendune

TYPESCRIPT

Free, open source, HTML email template editor and no code designer.

★ STARS

2.1k

⑂ FORKS

131

OPEN PROJECT→
// OTHER№ 007
Keila

Keila

ELIXIR

Open Source Newsletter Tool.

★ STARS

2.1k

⑂ FORKS

147

OPEN PROJECT→
// ANALYTICS№ 008
Notifuse

Notifuse

GO

Notifuse is an open-source & modern emailing platform

★ STARS

1.9k

⑂ FORKS

192

OPEN PROJECT→
// DEVOPS№ 009
DoubleZero

DoubleZero

ELIXIR

A markdown email micro service for the people!

★ STARS

1.2k

⑂ FORKS

66

OPEN PROJECT→
// DEVOPS№ 010
hyvor-relay

hyvor-relay

PHP

Open-Source Email API for Developers. Self-hosted Alternative to SES, Mailgun, SendGrid.

★ STARS

578

⑂ FORKS

31

OPEN PROJECT→
// ANALYTICS№ 011
hyvor-post

hyvor-post

PHP

Hyvor Post is a privacy-first, simple newsletter platform built on Hyvor Relay

★ STARS

29

⑂ FORKS

3

OPEN PROJECT→
// COMMUNICATION№ 012
Postal

Postal

RUBY

A fully featured open source mail delivery platform for incoming & outgoing e-mail

★ STARS

16.5k

⑂ FORKS

1.2k

OPEN PROJECT→

// EDITOR'S TAKE

useSend is the closest drop-in for the transactional half, offering an API and SMTP relay you can point at your own SES or SMTP backend, with hyvor-relay a leaner option when you only need the sending API. Listmonk covers the campaign side better than any of them, but be honest about the trade-off: none of these projects inherit SendGrid's IP reputation, so warm-up and deliverability become your job.

// FREQUENTLY ASKED

What is the best open source SendGrid alternative?

Listmonk is the most popular open source SendGrid alternative by GitHub stars (19,959 stars). The other 11 options are ranked above.

Are these SendGrid alternatives self-hostable?

Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.

Are they free?

All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.

// PART OF THESE COLLECTIONS

Best Open Source SendGrid Alternatives (12+ projects) | Open Source Startups