CyberMax-tools/saas-email-security-snapshot

DomainDNA: SaaS email security & tech stack snapshot

Check SPF, DMARC and MX for your own domains, by API: $5 for 1,000 checks. Buy now → · API key on screen the moment checkout ends · no subscription · 14-day refund if it doesn't work as described · help: cybermax.tools@gmail.com

Need it fresh, filtered or via API? This free file is a snapshot (one scan of SaaS domains' email security), last updated 2026-09-23.

• Mailvett email and domain check API (50 free calls a day, $5 for 1,000 (no expiry, no subscription), or $19/month for 5,000): checks any address or domain live: MX and mail provider, SPF and DMARC, disposable and role flags, typo fixes and domain age, by REST API or MCP; pay by card in one click, key shown instantly.
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• DomainDNA domain intel API (card checkout) (25 free domains a day, $5 for 1,000 (no expiry, no subscription), or $19/month for 5,000): checks tech stack (with evidence), email provider, SPF/DMARC and domain age for your own domains by REST API or MCP; pay by card in one click, key shown instantly, no Apify account needed (the DomainDNA Apify tool for bulk lists, TLS and monitor mode is linked from the same page).
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How do well-known SaaS companies protect their email domains and what do their websites run on? One row per domain per snapshot, from public DNS, TLS, RDAP and HTTP facts only:

• Email security: mail provider (Google Workspace, Microsoft 365, Proofpoint...), SPF presence and all qualifier, SPF includes, DMARC policy (none / quarantine / reject), subdomain policy, pct, reporting enabled.
• Infrastructure: nameservers, TLS issuer, protocol and days until certificate expiry, registrar, domain age and expiry.
• Website: detected technologies and categories (CMS, framework, CDN, analytics, marketing automation...), SaaS domain-verification TXT records (which tools a company has verified), security-headers score (0-6), robots.txt / sitemap.xml / llms.txt / security.txt presence.

First snapshot (2026-09-23), 50 SaaS domains: 39 publish DMARC p=reject and 11 p=quarantine; 36 receive mail on Google Workspace and 8 on Proofpoint; 39 serve an llms.txt and 31 a security.txt.

Use it

from datasets import load_dataset
ds = load_dataset("CyberMax-tools/saas-email-security-snapshot", split="train")
df = ds.to_pandas()
print(df.groupby("dmarc_policy").domain.count())
print(df[df.dmarc_policy != "reject"][["domain", "dmarc_policy", "mx_provider"]])

Files

data/snapshot-YYYY-MM-DD.parquet (one file per refresh, all in one train split; filter by snapshot_date to compare over time) and the same rows as .jsonl.

column	meaning
snapshot_date	date of the run (UTC)
domain, final_url, status_code, reachable	the site checked and where its homepage ended up
mx_provider, mx_hosts	mail provider inferred from MX records
spf_present, spf_all_qualifier, spf_includes, spf_multiple_records	SPF record facts (fail / softfail / neutral / pass)
dmarc_present, dmarc_policy, dmarc_subdomain_policy, dmarc_pct, dmarc_reporting	DMARC record facts
nameservers	NS records
tls_issuer, tls_protocol, tls_valid_to, tls_days_left	homepage certificate (measured on Apify, not behind a proxy)
registrar, domain_created_at, domain_age_days, domain_expires_at	RDAP registration data
technologies, technology_categories	detected from headers and HTML
saas_verifications	tools inferred from domain-verification TXT records (e.g. google, stripe, atlassian)
security_headers_score, hsts, csp, x_frame_options	HTTP security headers (score out of 6)
robots_txt, sitemap_xml, llms_txt, security_txt	well-known files present
summary	one-line plain-English verdict
analyzed_at	timestamp of the check

Get fresh data

• Any domain list, on demand (JSON for AI agents, MCP-callable): DomainDNA on the Apify Store.
• Browse this snapshot in your browser: free DomainDNA Space.

Notes

Public, non-personal data about company domains only. A snapshot, not a security audit: DNS and websites change daily. Detections are heuristic (tag and header fingerprints). Not affiliated with any company listed.

License: CC BY 4.0. Built by CyberMax.

More free from CyberMax

• All free CyberMax demos & datasets
• DomainDNA: SaaS Email Security Report
• Linkheft Open Domain Ranks (10.3M domains)

Quickstart notebook

Load this dataset with pandas and see real outputs in the quickstart notebook. Need it refreshed for your own list? DomainDNA — Tech Stack Detector & WHOIS: What Any Site Runs On.