Free tools
WHOIS lookup
Enter a domain you send from or operate. Results depend on registry and privacy redaction policies.
What this checks
Registrar, registration dates, expiry, nameservers, and domain status flags where available.
Why it matters
Expired or recently transferred domains can fail authentication or trigger filtering. WHOIS supports domain hygiene reviews.
Results
Common issues
- Domain nearing expiry without auto-renewal enabled.
- Recent registrar transfer without updated nameservers.
- WHOIS privacy hiding contacts needed for provider verification.
How to fix
- Enable auto-renewal and monitor expiry dates for sending domains.
- Confirm nameservers match your active DNS host after transfers.
- Keep registrar access secured with MFA.
How MailFleet helps
MailFleet teams audit sending domains for registration health alongside SPF, DKIM, and DMARC before major campaigns.
Related free tools
Delivery note: MailFleet helps users manage campaigns through their own sending providers. Delivery outcomes depend on sender reputation, DNS authentication, content quality, recipient engagement, list quality, provider rules, and mailbox filtering systems.
For regulatory context on commercial email in the United States, see the FTC CAN-SPAM compliance guide.
Frequently asked questions
Many registrars redact contact details for privacy. Nameserver and expiry data are usually still visible.
Get started
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- Linux (DEB & RPM)
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