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

Non-authoritative answer:
Name:	postmarkapp.com
Address: 3.130.12.113
Name:	postmarkapp.com
Address: 3.135.114.150
Name:	postmarkapp.com
Address: 3.147.5.171