Libraries use this method. To open a file on your own computer. A user name is the identification of the person who holds the mail account. The sub domain name then follows and the address ends with the Top Domain Name . There are usually no spaces in between letters or words in an address.
Most servers are case sensitive.
Type in addresses exactly as you find them. While the name and Post Office description will aid beginners and elementary students in understanding addresses, it is important to begin to use the correct terms once a level of understanding had been achieved.