How do I set up DMARC records for subdomains?

Setting up DMARC for subdomains involves creating TXT records in the DNS settings for each subdomain named `_dmarc.subdomain.example.com`. While subdomains inherit the main domain's DMARC policy by default if no specific policy is defined, you can specify a different policy for each subdomain for tailored email authentication and reporting. It is highly recommended to implement DMARC at the organizational level first. The initial DMARC policy should be set to 'p=none' to monitor traffic with the `rua` tag for receiving reports, and then gradually increase the policy to 'p=quarantine' or 'p=reject' after careful observation and adjustments based on email traffic. Use tools like MXToolbox to verify record configuration. New subdomains should be warmed up with small sending volumes. Ensure a well-formed DMARC record with correct syntax and placement within the DNS zone to avoid misconfigurations, including creation of an A record pointing to the mail server and configuring SPF. Consider using dedicated IP addresses for new subdomains.

Setting up DMARC for subdomains involves creating TXT records in the DNS settings for each subdomain, specifying the desired DMARC policy (e.g., p=none, p=quarantine, p=reject) and reporting options. It's generally recommended to first implement DMARC at the organizational level. Initial setup should start with a 'p=none' policy to monitor traffic and reports, then adjust to stricter policies based on the traffic. Tools like MXToolbox can be used to verify record configuration. Warming up new subdomains with small sending volumes is crucial. Ensure an A record points to the correct mail server, and configure SPF before DMARC. Dedicated IP addresses should also be considered for new subdomains.

Setting up DMARC records for subdomains requires careful attention to syntax and placement within the DNS zone to avoid misconfigurations that can harm deliverability. A phased approach to deployment is recommended, starting with monitoring ('p=none'), then testing ('p=quarantine'), and finally enforcing ('p=reject') to carefully observe and adjust email flows.

Setting up DMARC for subdomains involves creating a TXT record in the DNS settings for each subdomain. Subdomains inherit the main domain's DMARC policy by default if a specific policy isn't defined. You can specify a different policy for each subdomain for tailored email authentication, reporting, and stricter rules. DMARC policy queries first check for an exact subdomain match; otherwise, they query for the organizational domain's policy. Testing the DMARC record is vital to ensure correct implementation and policy enforcement.