Email and newsletters

ColdSire alternatives

2 open-source projects that already do 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/BillionMail15,392AGPL-3.0Self-hosted mail server and email marketing platform combining SMTP, newsletter and campaign management.Open on GitHub knadh/listmonk22,669AGPL-3.0High-performance, self-hosted newsletter and mailing list manager with a modern dashboard and analytics.Open on GitHub

What you give up either way

Access to ColdSire's 'premium pool' of mailboxes mixed with real businesses
The company-managed scale (100k+ mailboxes, 40k+ domains) and reputation
Instant mailbox setup and pre-configured optimal deliverability settings
One-click integrations and turnkey workspace isolation managed by vendor

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