What is a hostname?
Every legitimate internet ISP and WWW server using the Internet has a hostname!
Every email server MUST have a hostname and reverse DNS resolution to identify itself to other servers or the email SHOULD be rejected as Spam.
Check your IP with this tool and you should see...
The cloud can be a place of evil too ...
Public cloud use surges among DDoS attackers, research shows
Many web scrapers are using the cloud and so are clickbots.
You can use floating IP addresses to try to evade detection also.
In every cloud there is a dark lining
Attention: "role based name" email prefixes such as support, webmaster, info, contact, forum, service, affiliate, admin, traffic, partners, marketing, etc., for our member accounts are not permitted. They are acceptable for a vendor listing, but not for the member email. This is due to bulk email processors scrubbing them for delivery due to extremely high bounce rates. Please apply for membership using a personalized email prefix. Something like firstname.lastname@example.org.
If we discover you signed up with a role based name we will give you only one message to change it. After 3 days your account will be removed if the email is not changed.