A Hostname is a unique Fully Qualified Domain Name (FQDN) which contains a domain and a computer name for the purpose of identifying each computer that is used in the internet. It could be one or a group of labels which helps in identifying a computer in the domain name system(DNS) hierarchy.
Hope this helps.
The hostname utility!
hostname
no hostname
hostname.
With the following command: No hostname
ping hostname or nslookup hostname For more details: http://www.zilckh.com/how-to-find-ip-address-from-hostname-in-a-windows-system-using-command-line/
The hostname (the name of the computer) can be found in most Linux distributions by issuing the hostname command without arguments. Alternatively, you can view the contents of /etc/hosts. The hostname will be listed next to the IP address 127.0.1.1.
A hostname is the name a computer uses to identify itself to other computers on a network.
A hostname in an email address appears after the @ symbol, like user@hostname.com. The hostname is always the company or group that handles that email address.
Hostname is more of a UNIX thing than a Mac thing ;-) It can be changed in the Sharing section of System Preferences where it is known as Computer Name.
on the very right hand side of your hotmail account you will see a button "options" this will give you a menu, at the bottom of this menu there is an option " more options" This will lead you to a page an there you will find a section called "Junk Email" in this section there is a subsection called "safe and blocked Senders" if you go into this section you will see a small section called "blocked Senders" in here you can add the address of anyone you want to block
DNS issue