This system does not control DNS for the “example com” domain. You can install the suggested “DKIM” record locally. However, this server is not the authoritative nameserver. If you install this record, this change will not be effective. Contact the person responsible for the “XXXX.ns.Cloudflare(dot)com” and “YYYY.ns.Cloudflare (dot)com” nameservers and request that they update the “DKIM” record with the following:
DKIM is used to authenticate emails that you send. It has nothing to do with receiving email. You should add those DKIM records to your Cloudflare to better identify your outgoing email as authentic.
For incoming email you will want to review the Community #tutorial.