18.210.164.99
ec2-18-210-164-99.compute-1.amazonaws.com
3.226.59.186
ec2-3-226-59-186.compute-1.amazonaws.com
52.71.211.48
ec2-52-71-211-48.compute-1.amazonaws.com

inbound-smtp.us-east-1.amazonaws.com.
ucn-edu-co.mail.protection.outlook.com.