Why does the "www" disappear?

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Hello,

Today I did the whole "domain mapping" thing and it was successful. However, I don't understand why, when I type in "http://www.mydomain.com," o, the address has changed to "http://mydomain.com."

Why does the "www" disappear? It may seem like a silly question but I find it a little annoying. I wish it would show up properly!

Did I do something wrong, and if so is there any way to fix it?

Thanks in advance for any help,

 
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Blenderite
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