{"data":{"slug":"mailu","name":"Mailu","tagline":"MIT full mailbox stack: SMTP/IMAP/webmail — not tx API","category":"notifications","categoryName":"Notifications","url":"https://mailu.io","github":"https://github.com/Mailu/Mailu","pricing":"open-source","hook":"Mailu is full email hosting you self-host when Postal is outbound delivery and Resend is transactional API.","whatsGood":"MIT. SMTP + IMAP + webmail in one Docker-friendly stack. Real mailboxes for users, not just an HTTP send endpoint. Self-host is free.","theCatch":"Full mailbox SMTP/IMAP/webmail — not Resend/Plunk/Postal transactional-or-relay API. Ops-heavy: DNS, TLS, spam, storage. Distinct from Postal, Plunk, and Resend.","verdict":"MIT mailbox suite. Free to run; ops-heavy vs a tx email API.","addedAt":"2026-09-04","featured":false,"domain":"Comms","subSpecialty":"Email","capabilities":["mailbox","smtp","imap"],"surfaces":["API","Self-host"],"ecosystem":["Multi-platform"],"licenseModel":"OSS/MIT","githubStars":7487},"related":[{"slug":"ntfy","name":"ntfy","tagline":"HTTP pub-sub notifications you can curl from cron"},{"slug":"novu","name":"Novu","tagline":"MIT notification workflows with a real 0 USD Cloud"},{"slug":"listmonk","name":"Listmonk","tagline":"AGPL-3.0 self-hosted newsletters and transactional mail"},{"slug":"apprise","name":"Apprise","tagline":"BSD-2-Clause CLI that talks to a hundred notifiers"},{"slug":"gotify","name":"Gotify","tagline":"MIT self-host push server; Android-first, no ntfy.sh twin"}],"links":{"self":"/api/gems/mailu","html":"/gems/mailu","markdown":"/gems/mailu.md","category":"/api/gems?category=notifications","categoryPage":"/stacks/notifications"}}