3.220.37.8
ec2-3-220-37-8.compute-1.amazonaws.com
34.230.239.124
ec2-34-230-239-124.compute-1.amazonaws.com
35.170.148.251
ec2-35-170-148-251.compute-1.amazonaws.com

east.smtp.mx.exch081.serverdata.net.
west.smtp.mx.exch081.serverdata.net.