BillionMail vs Keila
BillionMail and Keila are both email marketing software. BillionMail is open source under AGPL-3.0, with 16k GitHub stars. Keila is open source under AGPL-3.0, with 2.3k GitHub stars.
Which to pick
- Pick BillionMail when
- You want to run your own mail server and campaigns together and know how to manage IP reputation.
- Pick Keila when
- You want a simple self-hosted or EU-hosted alternative to Mailchimp for newsletters.
Side by side
Bundles a mail server (Postfix, Dovecot, Rspamd) with newsletter and email marketing tools in one self-hosted package.
A newsletter tool for managing contacts, signup forms and campaigns, sending through SMTP, SES, Sendgrid or Mailgun.
Running your own outbound mail server is hard to get delivered; activity slowed after June 2026.
Pre-1.0, with a small team and fewer automation features than commercial tools.
Usable (both)
Self-hosted server
Self-hosted server and cloud service
Go, PostgreSQL, Redis, Postfix, Dovecot and Rspamd
Elixir, Phoenix and PostgreSQL
Open source, AGPL-3.0 (network copyleft) (both)
Use inside your business is unrestricted. If you change it and let customers use it over the internet, you must publish your changes. (both)
16k GitHub stars
2.3k GitHub stars
Young: started 20 months ago, latest release v4.9.
Established: started 5 years ago, latest release 0.40.1.
Other comparisons
More email marketing and newsletter software
Both sides were judged on 2026-11-03 from each project's README and GitHub data. License, age and popularity lines are worked out directly.