head to head · open source
Billion Mail vs BillionMail
Billion Mail has 16,171 GitHub stars, 1,801 forks, 236 open issues and last shipped 5 months ago. BillionMail has 16,171 stars, 1,801 forks, 239 open issues and last shipped 5 months ago. Billion Mail leads on adoption by 0% (16,171 vs 16,171 stars). Billion Mail is written in Go under AGPL-3.0; BillionMail is written in Go under AGPL-3.0. Billion Mail has attracted 11% as many forks as stars, BillionMail 11%. Billion Mail was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 11 topic tags (dovecot, email, email-marketing, mail), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Billion Mail | BillionMail | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 16K |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | Go | Go |
| Last push | 2026-06-11 | 2026-06-11 |
| Forks | ⑂ 1.8K | ⑂ 1.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Billion Mail if
- You weight community size — 16K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick BillionMail if
- You want the BillionMail feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Go
- You evaluated both and BillionMail fits your workflow better
About Billion Mail
BillionMail 📧 An Open Source MailServer, NewsLetter, Email Marketing Solution for Smarter Campaigns [![][license shield]][license link] [![][docs shield]][docs link] [![][github release shield]][github release link] [![][github stars shield]][github stars link] English 简体中文 日本語 Türkçe What is BillionMail? BillionMail is a future open source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts…
read the full Billion Mail overview →
About BillionMail
BillionMail 📧 An Open Source MailServer, NewsLetter, Email Marketing Solution for Smarter Campaigns [![][license shield]][license link] [![][docs shield]][docs link] [![][github release shield]][github release link] [![][github stars shield]][github stars link] English 简体中文 日本語 Türkçe What is BillionMail? BillionMail is a future open source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts…
read the full BillionMail overview →
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Frequently asked questions
Is Billion Mail or BillionMail more popular?
Billion Mail has 16,171 GitHub stars and BillionMail has 16,171. Billion Mail has the larger community by that measure.
Are Billion Mail and BillionMail free?
Both are open source. Billion Mail is licensed under AGPL-3.0 and BillionMail under AGPL-3.0. Neither carries a licence fee.
What is the difference between Billion Mail and BillionMail?
Billion Mail is written in Go and BillionMail in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Billion Mail or BillionMail?
Choose Billion Mail if you want the larger community (16,171 stars) or its AGPL-3.0 licence terms. Choose BillionMail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.