Inspect one infrastructure signal.

Look up a domain's SPF record and count its DNS lookups against the limit of 10.

Look up a domain's DMARC record and read its policy in plain English.

Look up a domain's DKIM selector and confirm the public key exists.

Run SPF, DKIM, and DMARC together for a sending domain before launch.

Look up MX records in priority order, detect the mail provider, and flag missing or null MX.

Check a domain and sampled mail server IPs against domain and email blocklists.

Check observable domain risk across age, blocklists, authentication, MX, and HTTPS signals.

Check observable cold email infrastructure across MX, SPF, DKIM, DMARC, blocklists, age, and tracking-domain signals.

Generate a pre-launch QA checklist for domains, inboxes, authentication, tracking domains, blacklist checks, and signoff.

Check observable Gmail, Yahoo, and Microsoft sender requirements from public DNS and optional pasted message headers.

Paste emails or domains and classify MX provider, free inboxes, security gateways, SPF, DMARC, and receive-mail readiness.

Check a branded cold email tracking domain for CNAME setup, DNS resolution, HTTPS, and redirect handoff.

Check MTA-STS and TLS-RPT records for inbound mail security posture before a cold email launch.

Check a custom SMTP egress IP for PTR, reverse DNS, and forward-confirmed rDNS before launch.

Check public evidence of prior sending, tracking hostnames, registration history, and current listings before you buy a domain.