On 2017-07-17, at 05:58, R.S. wrote:
>     ....
> 2. Uppercase and lowercase sorted in same order. ...
>  
By Internet standard, the domain is case-insensitive.  RFC 822 et al.
leave interpretation of the local-part entirely to the target site,
which is free to treat it as either case-sensitive or insensitive.

-- gil

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