Steps to address DMARC record changes:

• Verify the authenticity of the change: Make sure that the change was made by someone with the proper authorization. If you are unsure, check with your domain registrar or technical contact.
• Analyze the impact of the change: Review the new DMARC record and understand what it does and what effect it will have on your email system. For example, it might change the policy for handling unauthenticated emails or update the reporting options.
• Validate email functionality: Check your email system to make sure that it is still functioning as expected. If the change to your DMARC record causes any issues, you may need to modify your email infrastructure to ensure that it continues to operate properly.
• Monitor DMARC reports: DMARC reports provide information on how your domain's email is being handled by recipient mail servers. Regularly monitoring these reports can help you identify any potential issues and make necessary adjustments to your DMARC record.
• Update your documentation: Document the change to your DMARC record and keep track of any related changes or updates for future reference.
• It's important to take these steps to maintain the security and reputation of your domain, and to ensure that your email continues to function as intended.