8 Best Open Source ActiveCampaign Alternatives in 2026

1

Listmonk

High-performance newsletter manager with a transactional email API

AGPL-3.0 self-hosted newsletter and mailing-list manager built around PostgreSQL. It supports campaigns, subscribers, segmentation, templates, analytics, bounce handling, multiple SMTP providers, OIDC, S3-compatible media, and a transactional email API; it does not provide delivery infrastructure itself.

Pricing: Free self-hosted software; connect an SMTP provider or mail server.

• High-performance single binary with PostgreSQL
• Campaigns, subscribers, segmentation, templates, and analytics
• Transactional API, multiple SMTP servers, bounce handling, and OIDC
• Newsletter-first rather than API-first
• Requires an external SMTP provider or mail server
• Less focused on developer experience and React Email than Resend

2

Billion Mail

Self-hosted SMTP mail server with campaigns and analytics

AGPL-3.0 self-hosted email platform combining SMTP infrastructure with newsletters, marketing campaigns, analytics, domain configuration, and campaign management. It uses components such as Postfix, Dovecot, and Rspamd, so it operates more of the delivery stack than a provider-backed email API.

Pricing: Open-source self-hosted platform.

• Includes SMTP infrastructure and campaign tooling
• Newsletters, analytics, and domain management
• SPF, DKIM, and DMARC guidance with no built-in sending limit
• More infrastructure to operate than Resend
• Deliverability and sender reputation are your responsibility
• Recent commit cadence is slower than some newer projects

3

Mautic

Open-source marketing automation platform.

Mautic is an open-source marketing automation platform for managing leads and running campaigns, with lead management, email marketing, campaign automation, landing pages and forms, analytics and reporting, many integrations, and translations in 35+ languages. It is licensed under GPL-3.0 or later and can be self-hosted for free, with hosted and trial options from Mautic's partners.

Pricing: Free to self-host; paid hosting and services are offered by Mautic and its partners.

• Mature marketing automation with campaigns and lead nurturing
• Email marketing, forms, and analytics
• Large community and integrations
• Marketing-only: it is not a sales CRM on its own
• Self-hosting and email deliverability need maintenance

4

Plunk

Self-hosted transactional and marketing email platform

AGPL-3.0 email platform combining transactional API delivery, SMTP relay, campaigns, automations, contacts, segments, inbound email, analytics, custom domains, and SPF/DKIM setup. Can be self-hosted or used through a managed service.

Pricing: Self-hosted open-source platform with hosted service available.

• Transactional API and SMTP relay
• Campaigns, contacts, automations, and segmentation
• Inbound email, analytics, custom domains, and self-hosting
• Smaller ecosystem than Resend
• Marketing features may be unnecessary for transactional-only teams
• Self-hosting still requires a delivery provider or operating infrastructure

5

Notifuse

Open-source transactional and marketing email platform

Self-hosted platform (Business Source License 1.1 from v40, AGPL-3.0 for earlier versions) for transactional email and marketing, including newsletters, visual MJML editing, A/B testing, segmentation, contact timelines, multiple workspaces, analytics, REST API, S3 integration, and multiple sending providers.

Pricing: Open-source self-hosted platform; configure a supported sending provider.

• Transactional API and newsletter campaigns
• Visual MJML editor, A/B testing, segmentation, and analytics
• Multiple sending providers, workspaces, and self-hosting
• More marketing-oriented than Resend
• Business Source License from v40, source available until it converts to AGPL
• Requires an underlying email sending provider

6

Keila

Privacy-focused open-source email newsletter tool.

Keila is an open-source email marketing and newsletter tool with full data ownership, advanced segmentation, customizable templates, automation workflows, analytics, an API, and GDPR compliance. It is licensed under AGPL-3.0 and can be self-hosted.

Pricing: Free self-hosted; hosted plans available.

• Full data ownership and a privacy focus
• Segmentation, templates, and automations
• Active development
• No built-in publishing site or paid memberships
• AGPL-3.0 license

7

Sendportal

Laravel-based self-hosted email marketing platform

MIT self-hosted email marketing application built with Laravel, providing subscriber management, lists, segments, campaigns, tracking, workspaces, templates, and an API. It requires an external sending provider and has low recent development activity.

Pricing: MIT self-hosted software; connect an email sending provider.

• Laravel-based MIT project
• Subscribers, lists, segments, campaigns, and workspaces
• Tracking, REST API, and self-hosting
• Low recent development activity
• Marketing-first, not a direct transactional API replacement
• Requires an external sending provider

8

Hyvor Post

Privacy-first newsletter platform with no engagement tracking

AGPL-3.0 newsletter platform built on Hyvor Relay, focused on sending without open, click, location, or behavioral tracking. It includes subscriber lists, signup forms, templates, archive websites, team collaboration, and a management API.

Pricing: Open-source self-hosted newsletter platform built on Hyvor Relay.

• Newsletter delivery without engagement tracking
• Double opt-in, signup forms, lists, and archive sites
• Team collaboration, API, and Hyvor Relay integration
• Very small community and young project
• Newsletter-focused rather than transactional API
• Built around Hyvor Relay