Email Deliverability report incorrect

Hi, I can't understand what is the problem about incorrect reported dns records. The domain is the server FQDN PTR and both DKIM and SPF records are published, from the server console i can "dig" them correctly [root@kokokoko ~]# dig +short -x xxx.212.167.xxx kokokoko.domain.com. [root@kokokoko ~]# dig +short txt kokokoko.domain.com. "v=spf1 +mx +a +ip4:xxx.212.167.xxx ~all" [root@kokokoko ~]# dig +short txt default._domainkey.kokokoko.domain.com. "v=DKIM1\; k=rsa\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnrfwSd8pIDuiDtRDty18TLToNxq3+Fu9bQCouMgqsYFcIW31c1HnLNg1354+b9kF4V9YgYwo4IpS8vh/SRlkMDxuJzlzAmTd+XtU1+1fWbb0rCyvCnGPCE+G82XTj/M0ywuMcp7sF" "oaV4/ls76Iu3BvPQSU2sJEe78bUPFjbt2y0BqyzVyp58/UWyr5qd86sGv/LWMduA1oDIu6XDJfB6aTvwpB7MOv0uxggXY8yCsh/mnCaI8wbn7RYfH+9NI1m9867GrFDjY3BjC2NBS2msW8wQpSJNHYCSfqnBjfsdNT+sdomaCIZiaGlFoYrhOZL0mfslOhynxTQIDAQAB\;"
I also recorded dns raw traffic thanks to tcpcump, no queries about kokokoko.domain.com. are performed during this check. There is not a local dns zone about kokokoko.domain.com, so the query should be performed using external dns server How/Where can I debug what the Email Deliverability procedure is doing ? Is it mandatory to setup a local dns zone about the server FQDN ? Thanks ET