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-c.ic3-transport-smtp-lob.westus-prod.cosmic.office.net.
ic3-transport-smtp-lob-service.p01-nam-c.ic3-transport-smtp-lob.westus-prod.cosmic.office.net canonical name = cosmic-westus-ns-e5fe61bc8800.trafficmanager.net.
Name: cosmic-westus-ns-e5fe61bc8800.trafficmanager.net
Address: 20.168.157.133
| 
20.168.157.133