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

Non-authoritative answer:
smtp.mailtrap.io	canonical name = mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com.
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 54.158.84.126
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 3.209.246.195
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 18.215.44.90
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 3.86.141.192
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 54.80.103.13
Name:	mailsend-smtp-classic-f3a4534c019a3e96.elb.us-east-1.amazonaws.com
Address: 3.219.2.182