It can be anything! An apex, subdomain, or even a URL.
Results forwww.mx1.proofpoint.com.gslb.pphosted.com
mx1.proofpoint.com.gslb.pphosted.comproofpoint.com.gslb.pphosted.comcom.gslb.pphosted.comgslb.pphosted.compphosted.comcom
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