Show HN: Self-hosted email server for 2026 – single binary, CalDAV
fenilsonani Saturday, January 03, 2026
Built this after getting frustrated with the paying to a google for email. Now running it for 1 months in production.
What it does: - Full SMTP server (inbound/outbound, DKIM signing, SPF/DMARC checking) - IMAP with IDLE support - CalDAV/CardDAV (replace Google Calendar/Contacts) - Web admin panel with Prometheus metrics - Greylisting for spam prevention - Auto-discovery (mail clients configure themselves) - Audit logging for compliance
What it doesn't do: - Webmail (use Roundcube, etc.) - ML-based spam filtering (greylisting + basic heuristics only) - Clustering/HA
Summary
This article describes the development of an email server using Node.js and Express. It covers the setup of the server, handling incoming emails, and sending emails programmatically.
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Summary
github.com