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

Non-authoritative answer:
Name:	smtp.gmail.com
Address: 209.85.145.108
Name:	smtp.gmail.com
Address: 2607:f8b0:4001:c1e::6d