Open Source Alternatives
Open Source Email Alternatives to Mailchimp
Email marketing and automation platform.
Mailchimp is a trademark of its respective owner.
Updated Sep 2026
What you gain
- ✓No audience-size pricing starting at $13/mo for 500 contacts
- ✓Full ownership of your subscriber lists and campaign history
- ✓No feature gating between Essentials, Standard, and Premium tiers
- ✓Self-hosted email marketing with custom automation logic
What you give up
- △No drag-and-drop email builder with 100+ prebuilt templates
- △No Customer Journey Builder for multi-step automated campaigns
- △No built-in landing page builder with A/B testing
- △No managed audience segmentation with predictive demographics
Switching Cost
Mailchimp's lock-in is moderate. Subscriber lists export as CSV, and email templates export as HTML. But the Customer Journey automations, audience segments, and A/B test history don't transfer. Teams sending basic newsletters can switch in a day. Teams with complex multi-step automations, behavioral triggers, and e-commerce integrations should budget 1-2 weeks. The hidden cost is the automation rebuilds: every Customer Journey workflow needs manual recreation, and if you have dozens of triggered sequences, that's significant work.
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Drop-in Replacements
Ranked by feature coverage
notifuse
6480% coverageOpen-source, self-hosted newsletter, email marketing and transactional email platform. Visual MJML editor, Liquid templating, 7 sending providers.
Notifuse is a newsletter and transactional email platform that deliberately does not send email. It connects to Amazon SES, Mailgun, Postmark, Mailjet, SparkPost, SendGrid, or plain SMTP, and owns everything above that layer: a visual MJML template builder, contact lists with custom fields, segmentation, A/B tests, automation flows with delays and branching, a transactional API, and open and click analytics.
Listmonk
7875% coverageHigh-performance, self-hosted newsletter manager
Listmonk is the self-hosted answer to Mailchimp: a single Go binary and a Postgres database that handle subscribers, campaigns, templates, analytics, and sending. Point it at any SMTP provider (Amazon SES, Postmark, your own relay) and you own the list.
Mautic
7775% coverageOpen source marketing automation platform.
Mautic is the open source answer to HubSpot Marketing Hub and Mailchimp. Email campaigns, drip sequences, lead scoring, customer segmentation, and full marketing automation, all without the per-contact pricing that makes the commercial stack expensive at scale.
BillionMail
6365% coverageBillionMail gives you open-source MailServer, NewsLetter, and Email Marketing: fully self-hosted, dev-friendly, and free from monthly fees.
BillionMail runs your own mail server and your own newsletter platform in a single box. Not a Mailchimp style client that hands delivery off to Amazon SES, the actual SMTP server, plus Roundcube webmail, a campaign builder, contact lists and tags, and open and click analytics.
phplist3
5860% coverageFully functional Open Source email marketing manager for creating, sending, integrating, and analysing email campaigns and newsletters.
phpList was sending newsletters before most marketing SaaS existed, and it still does it at a scale that surprises people. Millions of recipients from a PHP application on an ordinary server, with subscribe pages, list segmentation, bounce processing, and campaign statistics.
Building Blocks
Mailchimp is a platform. It bundles multiple capabilities into one subscription. These tools each cover one piece. Teams often assemble 2–3 of them instead of paying for the full suite.
dittofeed
56covers: behavioral automation55%Open-source customer engagement. Automate transactional and marketing messages across email, SMS, mobile push, WhatsApp, Slack, and more 📨
Plunk
70covers: email campaigns50%Open source email platform
Postal
84covers: transactional email35%Fully featured open source mail delivery platform