Tim SPRACKLEN said:'Settings', 'General', 'Keyboard', 'Autocorrection' -> 'Off'
However, the iPad's Mail app keeps a list of recently used email addresses completely independently of your Contacts list. If you accidentally mistype an email address then, for quite a while, this mis-typed address will be offered to you as you start to type a similar email address. There is no way on the iPad to clear this list, however it is of finite length and this mistyped address eventually 'falls off the end' of the list.
Tim