I wasn't aware you could have more than one account on the same addy, but I guess the Xbox live ID counts as the unique identifier on one of them.
I know Positively you can have more than one account going to the same address But it really depends on your Email provider.
An example of this Is with Gmail.
Account#1= Account@gmail.com
Account#2= A.ccount@gmail.com
Both of these accounts will send an email to Account@gmail.com
This can also be used to rat out which websites are giving your email to spam bots. As google ignores any dots in your.name before the @gmail
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