For the name of a Third level you can use numbers, letters and the hyphen ‘-’
Characters such as &, _, @, ., etc. are not accepted.
There are certain names which CANNOT be assigned to the Third levels like, for example:
Aruba.it reserves the possibility of adding or taking away names from the above list at any time.
Article ID: 2468, Created On: 9/11/2009, Modified: 5/6/2011