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.p03-nam-c.ic3-transport-smtp-lob.westus-prod.cosmic.office.net.
ic3-transport-smtp-lob-service.p03-nam-c.ic3-transport-smtp-lob.westus-prod.cosmic.office.net	canonical name = cosmic-westus-ns-5315c4071d0c.trafficmanager.net.
Name:	cosmic-westus-ns-5315c4071d0c.trafficmanager.net
Address: 172.184.194.5