How do I implement DMARC with BIMI on multiple subdomains?

Implementing DMARC with BIMI on multiple subdomains requires a phased approach. BIMI needs DMARC enforcement (quarantine or reject) at the organizational level. However, this is only strictly needed when utilizing BIMI or AMP. Subdomains inherit the org policy but can have custom DMARC records to override this. A 'p=none' policy initially is vital to monitor & fix auth issues before strict enforcement. Ensure SPF/DKIM are correctly set up before moving to 'quarantine' or 'reject'. Granular control can be achieved by deploying separate DMARC policies at the subdomain level, tailoring authentication for each subdomain's email sending practices. Remember to add TXT records to each subdomain's DNS when implementing custom policies.

To implement DMARC with BIMI on multiple subdomains, it's essential to have a DMARC policy of 'quarantine' or 'reject' at the organizational domain level for BIMI to function correctly. Each subdomain can have its own DMARC record to override the main domain's policy, allowing for customized authentication requirements. It's strongly recommended to start with a 'p=none' policy to monitor email streams and address authentication issues before enforcing stricter policies.

Implementing DMARC with BIMI across multiple subdomains involves careful planning and a phased approach. BIMI requires DMARC enforcement (quarantine or reject) at the organizational domain level, though this is only a hard requirement if you intend to use BIMI or AMP. Subdomains inherit the organizational DMARC policy unless explicitly overridden with their own DMARC records. The consensus is to begin with a `p=none` policy to monitor email streams, identify authentication issues, and avoid disruptions before gradually enforcing stricter policies. Granular control over subdomain authentication is possible, tailoring DMARC policies to individual subdomain needs.

To implement DMARC with BIMI across multiple subdomains, it's essential to enforce a DMARC policy of either 'quarantine' or 'reject' at the organizational domain level to meet BIMI requirements. Subdomains inherit this policy by default. To implement different DMARC policies for specific subdomains, you need to create individual DMARC records for those subdomains. These records override the organizational policy, allowing for customized handling. The configuration involves adding a TXT record with the DMARC information to each subdomain's DNS settings.