No ANY records found for proofpoint-us.mail.protection.office365.us.
Try mail.protection.office365.us instead?
id 24086, opcode QUERY, rcode NOTIMP, flags QR RD RA ;QUESTION proofpoint-us.mail.protection.office365.us. IN ANY ;ANSWER ;AUTHORITY ;ADDITIONAL
whatsmydns.net ANY Record Lookup tool lets you query DNS servers and get instant results.
Looking for easier to understand results? Use the Global DNS Checker tool.