I have enable email confirmation for new registered user.
I have try myself to test it from different location.
But the confirmation email not found in respective email address.
There are a whole SLEW of problems it could be.
The very FIRST step is to test send an email from your site ACP to the address you get from this testing site..
ACP->Tools->Test outbound email
mail-tester.com is a free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems
www.mail-tester.com
You should hope to see similar to this
That will quickly tell you if you have deliverability issues... if it doesn't even get to them, then there are other underlying problems.
Are you sending your email with PHP? SMTP? Google?