Matt Simerson

Systems Engineer. Builder. Maintainer. Automation Engineer. Developer. I spend my time in the infrastructure layer — email, DNS, and the open internet — writing tools that are reliable, well-tested, and built to last. I've operated continuously available DNS servers since 1995. My focus is on reliability, automation, and clean, maintainable code.

🔭 I’m currently working on NicTool 3.0

What I Work On

Email infrastructure — SMTP servers, delivery pipelines, anti-spam, authentication (SPF, DKIM, DMARC)
DNS
Systems automation — provisioning, configuration management, FreeBSD
Open source maintenance — long-term stewardship of projects with active communities

📂 Featured Open Source Projects

Haraka — Node.js Mail Server

A fast, highly extensible, event-driven SMTP server. Haraka handles thousands of concurrent connections with a modular plugin architecture that makes it straightforward to add filtering, routing, auth, DKIM signing, and more. Developer and active maintainer with 188+ contributors and 5.6k stars.

JavaScript · SMTP · MTA · Node.js · 5,600+ ⭐ · 694 forks

NicTool — DNS Management Platform

A modern DNS management platform, rebuilt for the current internet. Includes:

@nictool/server - A web UI for managing DNS
api — NicTool API v3, a REST interface for DNS management.
dns-resource-record — DNS RR swiss army knife for Node.js and browsers and 39 record types.
dns-zone - Representation of a RFC 1035 DNS zone. Convert DNS zones between every common DNS server.
dns-nameserver - Config file parser and generator for nameservers

JavaScript · DNS · Node.js · ESM

Mail::DMARC — DMARC Implementation

A complete implementation of the DMARC email authentication standard in Perl. Covers policy parsing, reporting, and a web UI for viewing your reports. Mail::DMARC is bundled with with SpamAssassin.

Perl · Email Security · DMARC · SPF · DKIM

Mail Toaster 6 — Mail Server Provisioning

A full-featured mail server provisioning system built on FreeBSD jails. Automates the deployment of a complete, production-ready mail infrastructure for 5 users or 50,000 domains worth of users.

Shell · FreeBSD · Infrastructure · DevOps · 54 ⭐