100.26.96.251
ec2-100-26-96-251.compute-1.amazonaws.com
54.146.201.90
ec2-54-146-201-90.compute-1.amazonaws.com
54.221.204.50
ec2-54-221-204-50.compute-1.amazonaws.com

alt1.aspmx.l.google.com.
alt2.aspmx.l.google.com.
alt3.aspmx.l.google.com.
alt4.aspmx.l.google.com.
aspmx.l.google.com.
inbound-smtp.us-west-2.amazonaws.com.
mxa.mailgun.org.
mxb.mailgun.org.