shell:$ nslookup -timeout=2 -retry=1 'mail.notion.so'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	mail.notion.so
Address: 104.18.37.97
Name:	mail.notion.so
Address: 172.64.150.159
Name:	mail.notion.so
Address: 2a06:98c1:3100::ac40:969f
Name:	mail.notion.so
Address: 2606:4700:4409::6812:2561