@k12academics Thanks for reaching out. I'm happy to shed some light on this topic.
DMARC and DKIM settings are managed by your domain registrar or an IT administrator as part of your domain's DNS records, not by QuickBooks. So for this reason, I recommend consulting an IT professional to ensure everything is set up correctly and securely for your business.
Also, feel free to check out this article that covers how to troubleshoot if your customer's aren't receiving emails from QuickBooks Online.
