Koder Postal is a complete, self-hosted email server. Send, receive, and manage email with full ownership of your infrastructure — no third-party relays, no data harvesting, no limits.
Powered by Stalwart Mail Server. Everything you need to run production email, with zero external dependencies.
Full MTA with support for ports 25, 465 (implicit TLS), and 587 (STARTTLS). Deliver and receive emails directly — no relay needed.
Connect Thunderbird, Apple Mail, Outlook, or any IMAP client. Secure access via ports 143 (STARTTLS) and 993 (TLS).
HTTP/JSON-based email access. Faster sync, lower bandwidth, and push notifications. The successor to IMAP for modern apps.
Industry-standard email authentication out of the box. Every outgoing message is signed. Incoming messages are verified.
TLS everywhere — SMTP, IMAP, and JMAP all encrypted in transit. Your emails never travel in plaintext.
Embedded high-performance storage. No external database required. Fast reads, efficient compression, minimal footprint.
Built-in administration interface for managing accounts, domains, and server settings. No SSH required for day-to-day operations.
Create and manage multiple email accounts per domain. Individual quotas, aliases, and forwarding rules for each user.
Send emails from your applications via JMAP API or standard SMTP. Perfect for transactional emails, notifications, and automation.
Koder Postal runs as a single Stalwart Mail Server process, handling all email protocols and storage in one place.
Self-hosted, standards-compliant, and built for reliability. Deploy Koder Postal and stop depending on third-party email providers.