shell:$ nslookup -timeout=2 -retry=1 'gmr-smtp-in.l.google.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	gmr-smtp-in.l.google.com
Address: 172.253.132.14
Name:	gmr-smtp-in.l.google.com
Address: 2607:f8b0:4023:2c03::e