If the customer is using Infoblox DNS as their DNS management system, there is one additional thing to be aware of when delegating either DMARC or DKIM to Valimail

When adding an NS record (ns.vali.email) in Infoblox DNS, the Infoblox UI requires that you add at least one IP address for the Name Server. Since Valimail may occasionally change IPs addresses for the DNS service, adding IP addresses can cause problems. To address this in the Infoblox UI, enter an IP address of 255.255.255.255. This will cause Infoblox to dynamically query for the current IPs for ns.vali.email when resolving.