shell:$ nslookup -timeout=2 -retry=1 'smtp-hve.office365.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
smtp-hve.office365.com	canonical name = smtp-lob-tm-prod-global.trafficmanager.net.
smtp-lob-tm-prod-global.trafficmanager.net	canonical name = ic3-transport-smtp-lob-service.p01-nam-a.ic3-transport-smtp-lob.centralus-prod.cosmic.office.net.
ic3-transport-smtp-lob-service.p01-nam-a.ic3-transport-smtp-lob.centralus-prod.cosmic.office.net	canonical name = cosmic-centralus-ns-dc48da00ffac.trafficmanager.net.
Name:	cosmic-centralus-ns-dc48da00ffac.trafficmanager.net
Address: 20.84.251.185