Free outbound asset · ZIP + script
See any company's stack from public DNS records. Free.
Every company publishes DNS records. They show who hosts the company's email, whether Proofpoint or Mimecast filters it, and which tools it has verified its domain with. This script reads all of it for your whole list in about 2 minutes. No API key.
01
Email provider plus security gateway, so you know which leads need a plain-text, low-volume campaign.
02
Every service allowed to send as them: Salesforce, HubSpot, Marketo, SendGrid, Zendesk.
03
Tools they verified their domain with (Anthropic, OpenAI, Atlassian, Stripe...), read straight from the records with nothing guessed.
ZIP + SCRIPT
DNS Stack Scanner
Enter your details and the download link goes to your inbox.
What's inside
Run it on your list tonight.
In the ZIP
- dns_stack_scanner.py
- Setup guide + 5 ways to use it
- Example domains + real output
What you get back
- Mail provider, gateway, DMARC
- SPF senders + verified tools
- Summary stats for the whole list