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Forwarders that preserve DKIM pass along email without modification. This allows the final receiver to successfully check and validate DKIM.
No action can be taken. Forwarders that preserve DKIM are doing everything they can to interoperate with DMARC.
When deploying DMARC, domain owners often find that email can flow through forwarders before arriving at a final destination.
Domain owners then wonder if the forwarder is capable of interoperating with DMARC.
This directory contains information on the capabilities of various email forwarders.
