18.205.93.93
ec2-18-205-93-93.compute-1.amazonaws.com
54.243.220.187
ec2-54-243-220-187.compute-1.amazonaws.com

2600:1f18:4658:af01:a05f:d45c:b982:92c5
2600:1f18:4658:af02:7de9:e0d8:6999:b686

mail.nullapps.com.
mx1.nullapps.com.
mx2.nullapps.com.