It can be anything! An apex, subdomain, or even a URL.

Results formx1.mailhop.us

Resolver

Location

A

Name	TTL	Value
mx1.mailhop.us	60	52.29.118.68AWS EC2 (eu-central-1) / Amazon Technologies Inc.
mx1.mailhop.us	60	52.29.162.96AWS EC2 (eu-central-1) / Amazon Technologies Inc.
mx1.mailhop.us	60	54.148.222.11AWS EC2 (us-west-2) / Amazon.com, Inc.
mx1.mailhop.us	60	54.148.229.97AWS EC2 (us-west-2) / Amazon.com, Inc.
mx1.mailhop.us	60	54.149.205.143AWS EC2 (us-west-2) / Amazon.com, Inc.
mx1.mailhop.us	60	54.191.151.194AWS EC2 (us-west-2) / Amazon.com, Inc.
mx1.mailhop.us	60	54.191.214.36AWS EC2 (us-west-2) / Amazon.com, Inc.