Web & Mail Servers
Nginx, Apache, Postfix, Zimbra and email authentication (SPF, DKIM, DMARC).
Web & Mail Servers articles
SPF, DKIM, and DMARC End to End
The one-page mental model of SPF + DKIM + DMARC, plus a safe rollout order that won't blackhole your own mail.
October 24, 2026Zimbra: Common Issues and How to Fix Them
The Zimbra problems that page you at 2 a.m. — dead mailboxd, expired self-signed certs, a stuck queue, LDAP down — and the exact commands to fix them.
October 24, 2026How Nginx location Block Matching Actually Works
The exact order Nginx evaluates location blocks, why = and ^~ short-circuit regex, and the config that surprises everyone.
October 24, 2026HTTP Basic Auth with htpasswd on Nginx and Apache
The right way to put a password in front of a staging site or an internal endpoint — bcrypt hashes, per-location rules, and an IP-or-password combination.
October 24, 2026Let's Encrypt with Certbot, Including Renewal That Doesn't Break
Getting the first cert is easy; keeping renewal working for years is the part people get wrong. Webroot vs DNS-01, deploy hooks, and the failure modes.
October 24, 2026An Nginx Reverse Proxy With TLS, Done Properly
Copy-paste Nginx config for putting HTTPS in front of an app server — with the proxy headers, timeouts, and TLS settings people usually get wrong.
October 24, 2026Nginx as a Load Balancer
Nginx's upstream block turns it into an L7 (or L4) load balancer. Here's the balancing methods, passive health checks, upstream keepalive, and the retry semantics.
August 28, 2026