34.234.220.131
ec2-34-234-220-131.compute-1.amazonaws.com
35.171.116.18
ec2-35-171-116-18.compute-1.amazonaws.com
52.2.214.224
ec2-52-2-214-224.compute-1.amazonaws.com
52.23.88.194
ec2-52-23-88-194.compute-1.amazonaws.com
54.144.237.220
ec2-54-144-237-220.compute-1.amazonaws.com
54.172.236.190
ec2-54-172-236-190.compute-1.amazonaws.com

east.smtp.mx.exch091.serverdata.net.
west.smtp.mx.exch091.serverdata.net.