5 Open-Source Mailchimp Alternatives You Can Self-Host (2026)
Mailchimp Essentials charges $20/month for 500 contacts and 6,000 sends. Self-hosting removes both caps: a Liquid Web 2–4 GB Managed VPS running Listmonk can send to an unlimited subscriber list at the cost of your SMTP relay — typically $1–3 per 10,000 emails via Postmark or Mailgun.
Mailchimp's pricing scales steeply: 10,000 contacts on Essentials runs $57/month, and 50,000 contacts pushes past $270/month. The open-source alternatives below cover the full spectrum from single-purpose newsletter senders to full marketing automation platforms. All deploy on Docker Compose; none have per-contact or per-send fees beyond what your SMTP relay charges.
1. Listmonk (AGPL-3.0, ★ ~19.3k)
Listmonk is the simplest and most resource-efficient self-hosted newsletter tool available. A single Go binary backed by PostgreSQL handles subscriber import, list segmentation, campaign scheduling, bounce tracking, and open/click analytics — with an idle RAM footprint under 100 MB. It can process hundreds of thousands of emails per hour when pointed at a high-throughput SMTP relay.
For teams that primarily use Mailchimp for newsletters and one-off broadcast campaigns (not drip sequences or lead scoring), Listmonk covers the entire workflow at near-zero infrastructure cost.
Key features:
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Unlimited subscribers and lists — no tier gates
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Templated campaigns with Liquid-style templating and custom subscriber attributes
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Bounce processing via SMTP DSN
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Double opt-in with customizable confirmation emails
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REST API for programmatic campaign management
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Stars: ~19.3k · License: AGPL-3.0 · VPS recommended: 2 GB (Go + PostgreSQL)
2. Mautic (GPL-3.0, ★ ~9.5k)
Mautic is the most feature-complete open-source marketing automation platform: drag-and-drop email campaigns, lead scoring, contact segments, landing pages, forms, drip sequences, and multi-channel nurture workflows that directly match Mailchimp's automation builder — and then extend beyond it. If you're on Mailchimp Standard or Premium specifically for automation, Mautic is the direct self-hosted equivalent.
The important caveat for 2026: Mautic's parent company Acquia transferred governance back to the community in 2024, and the project now operates under the Mautic Association. Development has continued actively, but teams should factor in community-governed maintenance when evaluating long-term production use. The trade-off is worth it for most teams — Mautic's feature depth and the GPL license make it a strong choice.
Mautic is heavier than Listmonk: it's PHP + MySQL and idles at 600 MB–1 GB. A 4 GB VPS is the comfortable minimum; 8 GB for production with heavy contact volumes.
- Stars: ~9.5k · License: GPL-3.0 · VPS recommended: 4–8 GB
- Self-hosted Mautic guide
3. Billionmail (AGPL-3.0, ★ ~14.6k)
Billionmail takes a different approach than Listmonk and Mautic: it bundles a full self-hosted SMTP server with a bulk sending dashboard, making it the right choice for teams that need infrastructure-level email delivery rather than a Mailchimp-style campaign builder. Instead of relying on a third-party SMTP relay (Postmark, Mailgun, SES), Billionmail becomes the relay itself.
This makes it particularly useful for transactional email at scale, dedicated IP warmup, and bulk campaign sending where SMTP relay costs would be prohibitive. The campaign management UI is less polished than Mautic's but functional for most broadcast use cases.
Note: self-hosting an SMTP server adds deliverability responsibility — you'll need to manage SPF, DKIM, DMARC, and IP reputation yourself. For teams comfortable with that operational overhead, Billionmail eliminates per-email relay costs entirely.
- Stars: ~14.6k · License: AGPL-3.0 · VPS recommended: 4 GB + dedicated IP
- Self-hosted Billionmail guide
4. Mailtrain (GPL-3.0, ★ ~5.5k)
Mailtrain is a Node.js newsletter manager that predates Listmonk and covers similar ground: subscriber lists, campaigns, templates, and send scheduling. It's stable and well-understood, but its development pace has slowed significantly compared to Listmonk — fewer new features and longer intervals between releases. Teams evaluating Mailtrain versus Listmonk should default to Listmonk unless they have a specific dependency on Mailtrain's older feature set or existing deployments to maintain.
Mailtrain is included here because it remains a functional, production-proven option and some organizations still rely on it after years of deployment.
- Stars: ~5.5k · License: GPL-3.0 · VPS recommended: 2–4 GB (Node.js + MySQL)
- Official repo: github.com/Mailtrain-org/mailtrain
5. Keila (AGPL-3.0, ★ ~1.5k)
Keila is a modern newsletter platform built in Elixir (Phoenix framework) that emphasizes a clean, minimal UI and GDPR-first design. It covers the essential newsletter workflow — subscriber management, campaigns, custom templates, and send analytics — with a noticeably lighter footprint than PHP-based alternatives. The Elixir runtime gives it favorable concurrency characteristics for sending.
Keila is the newest tool in this list and has the smallest community, which means fewer third-party guides and less production track record. For teams that want a modern, cleanly-coded newsletter platform and are comfortable adopting a less-established project, Keila is worth evaluating. For teams that need proven scale, Listmonk remains the safer choice.
- Stars: ~1.5k · License: AGPL-3.0 · VPS recommended: 1–2 GB (Elixir, lightweight)
- Official docs: keila.io/docs/
Comparison table
| Tool | Best for | License | Idle RAM | Mailchimp feature match |
|---|---|---|---|---|
| Listmonk | Newsletters + broadcast campaigns | AGPL-3.0 | ~80 MB | Mailchimp Essentials campaigns |
| Mautic | Full marketing automation | GPL-3.0 | 600 MB–1 GB | Mailchimp Standard automation |
| Billionmail | Self-hosted SMTP + bulk sending | AGPL-3.0 | ~400 MB | Infrastructure layer |
| Mailtrain | Stable legacy deployments | GPL-3.0 | ~300 MB | Mailchimp Essentials campaigns |
| Keila | Modern, minimal newsletters | AGPL-3.0 | ~150 MB | Mailchimp Essentials (subset) |
Prices subject to change — verify Mailchimp pricing at mailchimp.com/pricing/ and Liquid Web at liquidweb.com/vps-hosting/managed-vps/.
Which tool should you choose?
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Replacing Mailchimp for newsletters only: Start with Listmonk. It is fast, resource-efficient, and covers everything Mailchimp Essentials does for broadcast email.
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Replacing Mailchimp Standard automation (drip sequences, lead scoring): Use Mautic. No other open-source tool matches its automation depth.
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Eliminating SMTP relay costs at scale: Add Billionmail for the sending layer and use Listmonk or Mautic as the campaign frontend.
For most teams, yes. Listmonk handles campaign management and scheduling but delegates actual email delivery to an SMTP relay. Postmark, Mailgun, Amazon SES, and Brevo all work well. The alternative is running Billionmail to manage your own SMTP server — which removes relay costs but adds deliverability management overhead (SPF, DKIM, DMARC, IP warmup).
Yes. Export your Mailchimp audience as CSV (Audience → Export Audience), then import into Listmonk via Subscribers → Import. Map the email and name columns; Listmonk supports custom subscriber attributes for any additional fields. Double opt-in re-confirmation is optional — existing subscribers who already opted in don't need to re-confirm unless your legal requirements demand it.
Yes, with caveats. The Mautic Association now governs the project, and active development has continued through 2025 and into 2026. The risk is not immediate — it's long-term: community governance can slow release cadence and security patch response compared to a well-funded commercial backer. Monitor the Mautic community forum and GitHub for release activity. For mission-critical production use, maintain a current backup and test each major upgrade before applying to production.