PLAYBOOK
Practical guides to domains that must work.
Why each part of DNS, email authentication and monitoring matters — what breaks when it is missing, and how to check yours in under a minute.
Why Mail Servers Judge Your IP by Its PTR Record
Reverse DNS is the one mail setting you cannot fix in your own DNS zone. Here is what receivers check, why a missing PTR costs you delivery, and how to get one.
Read the guide →Who Changed That DNS Record?
Zones drift — agencies, ex-vendors, a developer "just testing". Most changes are harmless and one is a hijack. You cannot tell them apart without a baseline.
Read the guide →Stop reading, start checking.
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