Billionmail/BillionMail
BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr
Open source alternative to Mailchimp
BillionMail is an open source Go project by Billionmail, created in February 2025. It has 15,936 stars and 1,754 forks on GitHub and is released under the AGPL-3.0 license. Its most recent commit was on Jun 11, 2026, and it has 230 open issues, 2 of them labelled “good first issue”, which makes it a friendly place to start contributing. Its GitHub topics include email-marketing, mail, mailserver, and email.
15,936 stars today
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