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BillionMailMarketing & SEOAGPL-licensed mail server and newsletter platform for Linux. Docker Compose deploys Postfix, Dovecot, Rspamd, Roundcube and a Go console for domains, contact lists, campaign tasks, a transactional sending API and delivery analytics.Open sourceSelf-hosted
DittofeedMarketing & SEOOpen-source customer engagement platform for event-driven email, SMS and webhook messaging, with segments, journey builder, broadcasts and templates. Self-hosted with Docker Compose or Helm; the vendor's cloud closed on October 31, 2026.Open sourceSelf-hosted
EspoCRMCRM & Customer PlatformsEspoCRM is an AGPLv3 CRM with accounts, leads, opportunities, cases, email and campaigns, an Entity Manager for custom entities and a REST API. It runs on PHP with MySQL, MariaDB or PostgreSQL, via Docker, or in EspoCRM Cloud.Open sourceSelf-hostedFreemium
listmonkMarketing & SEOAGPL-licensed newsletter and mailing list manager that runs as one Go binary with PostgreSQL. It handles opt-in lists, SQL segmentation, templated campaigns, a transactional mail API, bounce processing, analytics and SMS or push messengers.Open sourceSelf-hosted
MailCheapMarketing & SEOMailCheap is an AGPL-3.0 newsletter app for writing, sending and publishing issues from a dashboard, REST API or AI agent. Self-host it with Amazon SES or PostShiba, or use MailCheap Cloud from $19 a month for 20,000 emails.Open sourceSelf-hostedFreemium
MauticMarketing & SEOGPL-3.0 marketing automation platform on PHP and MySQL or MariaDB: contact tracking, segments, campaign builder, email and SMS, forms, landing pages, points, REST API and webhooks. Self-host it or use paid managed plans from an official partner.Open sourceSelf-hostedFreemium
NotifuseMarketing & SEONotifuse is a self-hosted email marketing and transactional email platform in Go and React with a visual MJML editor, automations, web analytics and seven sending providers. Source-available under BSL 1.1, with EU Cloud plans.CommercialSelf-hostedFreemium
PlunkAPIs & IntegrationsPlunk is an AGPL-3.0 email platform that combines a transactional API, SMTP relay, campaigns, segments and event workflows on one contact list. Use the hosted service at $0.001 per email or self-host it with Docker and your own Amazon SES account.Open sourceSelf-hostedFreemium
useSendAPIs & IntegrationsuseSend is an AGPL-3.0 email platform that sends through Amazon SES. It offers a REST API, SMTP relay, TypeScript, Python and Go SDKs, campaigns, contact books, webhooks and analytics, as a hosted service or a self-hosted Docker install.Open sourceSelf-hostedFreemium