Reading the records…
Reading the records…
Unrecognised domains count as one organisation each, so the true number may be lower.
Asking 2 registries for registration dates.
Registration dates never change the grade; most domains renew automatically.
Named in SPF. These can approve servers to send as tsinghua.edu.cn.
Not in our catalogue
Falling means someone else controls its DNS, by lapse or hijack.
They can approve any server to send as tsinghua.edu.cn, and that mail passes SPF and DMARC.
And 2 more names on this domain.
Asking the registry.
Mail comes to your own servers.
Reports stay on your own domain.
Built from SPF, MX and DMARC report addresses. Your DNS host and DKIM services are not shown, as public DNS does not list them. This shows what is at stake, not current risk.