Dns
See Every SaaS Vendor a Company Uses From One Lookup | DNSai
How to find the SaaS vendors in a company's SPF record: what include: really means, what macro records hide, and 14 live lookups from 2026-08-01.
DNS Guides & Updates
Learn about DNS records, email authentication, DNSSEC, and stay updated on DNSai tools and features.
Dns
Email
DMARC p=none Is Not Protection. Here's the Path to Reject | DNSai
RFC 9989 says a discovered p=none MUST NOT change mail handling. The evidence-driven path from DMARC p=none to p=reject, and why the pct tag is gone.
Email
Which Email Gateway Does a Company Use? Read the MX | DNSai
How to identify the email gateway a company uses from its MX records: vendor hostname patterns, RFC priority rules, and live 2026-08-01 lookups.
Tutorial
How to Find a DKIM Selector Without the Email Headers | DNSai
How to find a DKIM selector when you have no message to read: the RFC limits, a vendor dictionary, DMARC reports, and live 2026-08-01 lookups.
Security
What Your DNS Records Are Telling Your Competitors | DNSai
Your MX, SPF and CNAME records are public by design. What competitors can actually learn from them, what they can't, and why CT logs are permanent.
Tutorial
SPF PermError: How to Fix Too Many DNS Lookups | DNSai
Your SPF record returns PermError. Confirm which of five causes you actually have, count lookups against RFC 7208's limit of 10, and fix the right one.