Guides
Notes on the things that quietly break email.
Written from actual diagnostic work rather than keyword research. Each one covers a problem we see repeatedly, including the cases where the honest answer is that nothing can be done.
Deliverability
Why business emails land in spam
The four distinct causes behind the same symptom — authentication, alignment, reputation and sending behaviour — and how to tell which one you have before changing anything.
8 min read
Email authentication
How to check SPF, DKIM and DMARC on your own domain
The exact DNS queries to run, how to read the answers, and the misconfigurations that pass a casual look but fail in production.
7 min read
Email authentication
The SPF ten-lookup limit, and how to get under it
Why a valid-looking SPF record silently stops working once you add a fourth sending platform, how to count the lookups it really costs, and the ways out that do not break anything.
6 min read
Email authentication
Moving DMARC from monitoring to enforcement without losing mail
A staged path from p=none to p=reject: what the aggregate reports have to show you first, what order to change things in, and the point at which it is safe to stop.
7 min read
Rather have your own domain checked?
The health check applies everything in these guides to your live DNS and tells you what it finds.