Self-hosted email servers and newsletters: 33 open-source projects (2026)

Self-hosted newsletter and mailing list manager shipped as a single Go binary, backed by PostgreSQL.

A containerized, production-oriented mail server bundling Postfix, Dovecot, and anti-spam/antivirus tools, configured through plain files instead of a SQL database.

Open source mail delivery platform for sending and receiving email, a self-hosted alternative to services like SendGrid, Mailgun and Postmark.

Self-hostable all-in-one mail and collaboration server in Rust, supporting IMAP, JMAP, POP3, SMTP, CalDAV, CardDAV and WebDAV.

A self-hostable email service built on Cloudflare Workers, letting you create multiple mailboxes under one domain with sending, attachments and a responsive web UI.

A one-click installer that turns a fresh Ubuntu 22.04 machine into a complete self-hosted mail server with webmail, DNS, and backups.

Dockerized, self-hosted mail server suite bundling Postfix, Dovecot, SOGo, Rspamd and ClamAV behind a web admin UI.

A self-hosted mail server packaged as a set of Docker images, covering SMTP, IMAP, POP3 and webmail.

A browser-based multilingual IMAP webmail client with an application-like interface, written in PHP and extendable through plugins and skins.

A full-featured, secure mail server in Go for self-hosting your own domain's email with low maintenance.

Open-source, self-hostable email platform for transactional emails, marketing campaigns, and workflow automation, positioned as an alternative to SendGrid, Resend, and Mailgun.

Mail hosting and management platform with a modern web UI, admin panel and webmail, built on Postfix and Dovecot.

A single-file, self-hosted private email server with SMTP, POP3 and IMAP support plus a web mail management interface for your own domain.

Self-hosted newsletter, email marketing and transactional email platform with a visual MJML editor, Liquid templating and seven sending providers.

Open source newsletter tool for sending email campaigns and building sign-up forms, an alternative to Mailchimp.

Self-hosted email marketing app for managing subscribers, lists, campaigns and message tracking, built on PHP and Laravel.

SOGo is an open-source groupware suite offering calendaring, address books, and webmail, with native CalDAV, CardDAV, and IMAP support.

Self-hosted email inboxes for AI agents, with REST and MCP APIs, SMTP, human approval for risky mail, and signed webhooks.

A scalable IMAP/POP3 mail server that stores all data, including emails, in a sharded and replicated MongoDB cluster.

Open source, full-featured mail server solution for mainstream Linux and BSD distributions.

A lightweight, self-hostable webmail client that combines multiple email accounts into one view over IMAP, SMTP, JMAP and EWS.

A simple, lightweight, web-based email client written in PHP that needs no database.

Self-hosted or cloud newsletter app that charges you per email sent via Amazon SES rather than per dormant subscriber.

Self-hosted browser webmail client for the Stalwart Mail Server, covering mail, calendar, contacts and files over JMAP.

A mail client app for Nextcloud that connects to any IMAP account from within your Nextcloud instance.

Self-hosted, open-source email API that sends mail over SMTP from your own infrastructure, with logs, bounce handling and webhooks.

Self-hosted, open source email marketing manager for creating, sending, and analysing campaigns and newsletters.

A self-hosted webmail client that merges multiple IMAP/SMTP email accounts into one unified inbox.

Cyrus IMAP is a self-hosted mail, contacts and calendar server that serves email over IMAP, JMAP, POP3, CalDAV, CardDAV and WebDAV.

Self-hostable email marketing platform on Rails and AWS SES, with a built-in AI agent and an MCP server for drafting, segmenting and sending campaigns.