52.20.172.249
ec2-52-20-172-249.compute-1.amazonaws.com
54.163.228.80
ec2-54-163-228-80.compute-1.amazonaws.com

alt1.aspmx.l.google.com.
alt2.aspmx.l.google.com.
aspmx2.googlemail.com.
aspmx3.googlemail.com.
aspmx.l.google.com.
inbound-smtp.us-east-1.amazonaws.com.