The Email Stack Scan a domain
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Stack detector

/stack

See every email tool a domain sends with, and the DNS record that gave each one away.

Reads MX, SPF, DKIM and DMARC from public DNS. Nothing is stored.

How the stack shows in DNS

  1. What it is

    Every email tool a domain sends with leaves a trace in public DNS — an SPF include, a DKIM selector, an MX host.

  2. Why it matters

    Read those traces together and the whole sending stack becomes visible, layer by layer.

  3. Without it

    Without reading DNS, the only way to know a domain's tools is to ask — or guess.

How it works

  • Reads the domain's MX, SPF, DKIM and DMARC records from public DNS
  • Matches SPF includes, DKIM selectors and MX hosts against known tool signatures
  • Names the tool at each layer — mailbox, marketing, transactional and more
  • Shows the exact record that revealed each one

Common questions

How accurate is detection?

It's best-effort. We identify tools that leave a clear DNS fingerprint. A tool used only for reading mail, or behind a custom setup, may not show. We never guess without evidence.

Do you access the domain's email?

No. Everything is read from public DNS records. We never touch an inbox or send any mail.