2026.06 / email guide 008
Docker Mailserver multi-domain setup
A practical checklist for adding another domain to Docker Mailserver without breaking existing mail, DKIM, PTR/rDNS, TLS, or mailboxes.
// Adrian Marikar
Notes on software, systems, and small bets.
A fast, high-contrast home for essays, build logs, and practical observations about technology, internet businesses, automation, and turning ideas into shipped work.
// about this site
Clear thinking, useful projects, and practical notes.
Adrian Marikar writes about practical technology, internet businesses, product experiments, and the craft of turning rough ideas into useful things. The design is dark and energetic, but the goal is simple: readable posts and useful ideas.
// latest writing
Start here
Short reads, practical guides, and build notes. The archive is built to grow without slowing down.
2026.06 / infrastructure log 007
How email is handled on this VPS
How the VPS uses Docker Mailserver, DNS, SPF, DKIM, DMARC, Let’s Encrypt, and Himalaya for self-hosted mail.
2026.06 / build log 006
How this blog is built and maintained
The static HTML, GitHub, Docker, nginx, Coolify, Cloudflare, and Hermes workflow behind adrianmarikar.com.
2026.06 / build log 005
RaceEdge: transparent racing research
How I’m building raceedge.uk as a real-data UK & Ireland racing research app with explainable scoring, paper tracking, and Coolify deployment.
2026.06 / guide 004
My AI app factory
How I use a Hetzner VPS, Hermes agents, Coolify, GitHub, Cloudflare, and Telegram to ship apps with AI.
Performance first.
Static pages, tiny dependencies, cached assets, and no client-side framework required to read a sentence.
Static pages, tiny dependencies, cached assets, and no client-side framework required to read a sentence.
Built to mutate.
New essays, experiments, notes, and project pages can be added with simple files and a Git push.
New essays, experiments, notes, and project pages can be added with simple files and a Git push.