Billion Mail

Mailchimp scales invoices with subscriber counts and locks multi-domain deliverability behind recurring monthly subscriptions. Billion Mail packages a complete mail server and broadcast campaign system onto a self-hosted Linux stack without seat or contact limits. Small teams gain direct control over outbound queues, DNS authentication, and inbox storage on their own hardware.

Why Billion Mail instead of Mailchimp

Mailchimp centralizes list management, template building, and deliverability inside a hosted environment where teams never see the underlying Mail Transfer Agent. Billion Mail collapses the separation between mail server and email marketing platform by combining Postfix, Dovecot, Rspamd, Roundcube, and a Go-based campaign engine into a single containerized deployment. For operations leads, this changes the workflow: instead of uploading contacts into a closed third-party cloud and configuring external webhooks, contacts remain in an internal PostgreSQL database with direct REST API access for transactional triggers and newsletter dispatching.

The trade-off lies in infrastructure responsibility and marketing automation depth. Mailchimp handles IP reputation warming, feedback loop processing with major mailbox providers, and multi-branch automation journeys out of the box. Billion Mail provides the tools to manage SPF, DKIM, and DMARC verification along with custom SMTP relay routing through providers like SendGrid or Resend when port 25 is restricted by cloud hosts, but ops teams must monitor their own server IP reputation and handle delivery health. Teams migrating from Mailchimp gain zero-cost contact scaling and native webmail mailboxes, while trading away drag-and-drop customer journeys for scheduled batch blasts and template spintax variations.

What it does well

• Bundles Postfix for SMTP, Dovecot for IMAP, Rspamd for spam filtering, and Roundcube for webmail inside Docker without manual daemon configuration.
• Built-in DNS assistant generates SPF, DKIM, DMARC, and MX records per domain, validating DNS alignment directly from the web panel.
• Outbound SMTP relay support routes mail through providers like AWS SES, SendGrid, or Mailgun when cloud hosts block port 25.
• Multi-domain and multiple IP binding allows agencies to segregate client sending identities and assign specific public IPs to distinct domains.
• Campaign manager supports contact tags, CSV imports, spintax variations, template variables, and scheduled batch delivery.