Email and newsletters

Keplars alternatives

1 open-source project that already does this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

Billionmail/BillionMail15,393AGPL-3.0Self-hosted mail server and email marketing platform for newsletters, delivery, and campaign management.Open on GitHub

What you give up either way

Enterprise-grade deliverability tuning and warmup orchestration
Multi-region failover and SLA-backed infrastructure
Built-in OAuth sending via Gmail/Outlook with polished UX
24/7 expert support and migration help
100+ native integrations and official SDKs across many languages

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Keplars, and it does not prove anyone has run it for a month. How we decide.