In custom auth table even if email field is set to unique=true, if user 
inputs two different values different in case ex.( 'em...@gmail.com' and 
'em...@gmail.com' ) it will accepts both and will store both of them in 
database. Hence enabling a user to signup with the same email id multiple 
times with multiple usernames. 

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Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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