Stalwart
Stalwart Mail Server is an open-source mail server solution with JMAP, IMAP4, POP3, and SMTP support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable.
System Specifications & Architecture
Core Architectural Capabilities
Enterprise & Business Deployment Scenarios
Cost Optimization & Subscription Elimination
Replace recurring per-seat cloud SaaS fees by self-hosting Stalwart on existing VPS or private cloud instances, achieving immediate infrastructure cost savings.
Target: Startups & Growing Tech Companies
Strict Data Sovereignty & Regulatory Compliance
Operate Stalwart entirely within your private VPC boundaries. Ensure all intellectual property and sensitive customer records never leave company servers.
Target: Healthcare, Finance & GDPR/HIPAA Regulated Firms
White-Label & Custom Client Solutions
Deploy custom, branded instances of Stalwart directly into your clients' environments as high-margin managed infrastructure services.
Target: Digital Agencies, DevOps & Systems Integrators
Private Internal Tooling Behind VPN
Host Stalwart securely behind WireGuard, Tailscale, or Cloudflare Zero Trust without public exposure, providing safe, high-speed intranet tools for staff.
Target: Engineering, IT & Security Teams



