Your email domain will be misused / impersonated if there is NO DMARC or the DMARC policy is set to p=None.
Only if your DMARC policy settings are Quarantine or Reject, your domain is safe.
Before setting DMARC policy to Quarantine or Reject , the entire email traffic to Internet from your domain has to be analysed, else your genuine emails can get quarantined or rejected.
A quick check to monitor your Domain – DMARC, SPF & DKIM status
Frequently Asked Questions (FAQ) regarding DMARC, SPF & DKIM
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