DNS email checks not applicable
SPF, DMARC, CAA, DNSSEC, MTA-STS, TLS-RPT, and DKIM were not looked up because the host is local.
Why it matters
Those records describe a public DNS zone. A local name does not have one that matters here.
What to do
This result is skipped, not a pass. Scan the public domain to see mail and CAA posture.
Reference
SPF, DKIM, and DMARC authenticate mail. CAA and DNSSEC are separate DNS controls and use their own references.