13 free tools
Diagnose DNS, authentication, connectivity, and reputation signals before outbound campaigns. Each tool is purpose-built for a specific check — no account required to run diagnostics.
Free email verifierCheck DNS, authentication, and tracking health for a sending domain.
Open toolCheck SPF, DKIM, DMARC, and MX records from one place.
Open toolInspect SPF records and highlight common deliverability issues.
Open toolGenerate an SPF record from providers, custom includes, and IP ranges.
Open toolValidate DKIM selector records for your domain.
Open toolCheck DMARC policy, reporting, and alignment configuration.
Open toolGenerate a DMARC record with policy, reporting, and alignment options.
Open toolInspect MX records and mail routing configuration.
Open toolAnalyze raw email headers for authentication and routing signals.
Open tool