Blog
Field notes on DNS, email deliverability, TLS and network security.
DMARC
Understanding DMARC Alignment (and Why Your Mail Fails)
SPF and DKIM can pass while DMARC still fails. The missing piece is alignment — here's how it actually works.
Jul 5, 2026 · 7 min read
SPF
When and How to Flatten Your SPF Record
The 10-lookup limit is easy to blow past. Flattening helps, but it comes with maintenance trade-offs.
Jun 28, 2026 · 6 min read
SSL
Never Get Paged for an Expired Certificate Again
Expiry outages are entirely preventable. A layered monitoring approach catches them weeks in advance.
Jun 15, 2026 · 5 min read