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Self-Hosted Email Marketing Newsletter Email Server SMTP Mail Transfer Agent Campaign Management

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Last Updated: 08-22-2026 11:27 AM (UTC)

BillionMail

With over 15,000 GitHub stars accumulated since its February 2025 launch, BillionMail delivers the rare combination of a production mail transfer agent and a full email marketing suite in a single self-hosted package — eliminating the monthly per-subscriber fees charged by Mailchimp, SendGrid, and similar platforms. The Go-based architecture bundles Postfix for SMTP transmission, Dovecot for IMAP and POP3 mailbox access, Rspamd for intelligent spam filtering and greylisting, and RoundCube for browser-based webmail, all orchestrated through Docker Compose with PostgreSQL for persistent storage and Redis for queue management and caching. The marketing engine supports unlimited subscriber lists with tag-based segmentation, scheduled campaign sends, A/B subject line testing, and both HTML and drag-and-drop visual template editors for crafting responsive emails without coding. Real-time analytics dashboards track sent volume, deliverability rate, open rate, click-through rate, and bounce reasons, while the platform provides step-by-step DNS record configuration wizards for SPF, DKIM, and DMARC to maximize inbox placement. A transactional email API exposes REST endpoints for single and batch sending, enabling integration with CRM systems, e-commerce platforms, and custom applications. Auto-provisioned free SSL certificates, Fail2ban brute-force protection, and privacy-first architecture with zero third-party tracking ensure secure operation. The platform installs in under eight minutes via a single shell script and supports SMTP on port 25, SMTPS on 465, submission on 587, IMAP on 143/993, and POP3 on 110/995. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPLv3 licensed.

BillionMail
BillionMail
BillionMail
BillionMail
BillionMail

Benefits

  • Complete Mail Infrastructure in One Package
  • Bundles Postfix MTA, Dovecot IMAP/POP3, Rspamd spam filtering, RoundCube webmail, and marketing automation into a single Docker Compose deployment requiring no external services.
  • Unlimited Sending Without Per-Subscriber Fees
  • Eliminates monthly SaaS costs by self-hosting the entire email pipeline with no artificial rate limits, subscriber caps, or per-email charges imposed by the platform.
  • Guided Deliverability Optimization
  • Step-by-step DNS wizards configure SPF, DKIM, and DMARC records correctly while real-time analytics track delivery rates, bounces, and inbox placement metrics.
  • Visual Campaign Builder and API
  • Drag-and-drop template editor and HTML mode create responsive emails while REST API endpoints enable programmatic single and batch transactional sending.

Features

  • Full MTA Stack
  • Postfix handles SMTP/SMTPS/submission delivery, Dovecot serves IMAP and POP3, and Rspamd provides spam scoring, greylisting, and DKIM signing.
  • Marketing Campaign Engine
  • Schedule campaigns to subscriber groups with tag segmentation, A/B subject testing, open/click tracking, and automated unsubscribe link management.
  • Drag-and-Drop Template Editor
  • Visual component-based editor builds responsive email templates without HTML knowledge, with variable substitution for personalized content delivery.
  • Transactional Email API
  • REST endpoints for single and batch email sending with authentication, enabling integration with CRM, e-commerce, and custom application workflows.
  • Real-Time Analytics Dashboard
  • Homepage metrics display sent volume, deliverability rate, open rate, click-through rate, and bounce reasons with per-campaign drill-down reporting.