Set up DMARC and see who's sending email using your brand's domain.

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A Record Checker

MX Record lookup

Use This Tool To Lookup, And Validate Your DNS Records.

Check your DNS record

domain security tools

More tools to check your domain health

DMARC checker

Check if your domain has a DMARC record.

BIMI checker

Check if your domain has a BIMI record.

SPF checker

Check if your domain has a SPF record.

DKIM checker

Check if your domain has a DKIM record.

TLS-RPT checker

Check if your domain has a TLS-RPT record.

MTA-STS checker

Check if your domain has a MMTA-STS record.