18.116.212.137
ec2-18-116-212-137.us-east-2.compute.amazonaws.com
18.189.94.175
ec2-18-189-94-175.us-east-2.compute.amazonaws.com
3.20.183.111
ec2-3-20-183-111.us-east-2.compute.amazonaws.com

2600:1f16:90b:ac00:19cc:b877:f7c0:478
2600:1f16:90b:ac11:81e:c0f8:96df:e375
2600:1f16:90b:ac22:71cb:acc3:c0bf:3bc9

inbound-smtp.us-east-1.amazonaws.com.