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Email domain authentication checker

Look up public DNS records for the sending domain and review SPF and DMARC results.

Use a plain domain only—no URL, email address, path, or port.

This check can confirm

  • • Whether public SPF and DMARC TXT records are present.
  • • A published DMARC policy, when readable.
  • • Why DKIM needs your sending provider or a known selector to verify.

Before you start agent outreach

Pair a healthy sending setup with a clear, recipient-respecting campaign plan.

Check email preflightView masked sample

Gmail's sender guidance is updated periodically. Review the current Gmail sender guidelines and your provider's setup instructions before sending.