DMARC-capable receivers can identify sources of email and flag them as a trusted forwarder if the receiver trusts the source of email and does not wish to apply DMARC policy against the email source. This local policy decision is specific to the DMARC-capable receiver.
No action can be taken unless the DMARC-capable receiver appears to be trusting an illegitimate source. In this case, contact the DMARC-receiver directly with evidence of illegitimacy.