Magento is sending the order confirmation mail to my store email but also to a gmail a hotmail and other email address.
I also receive the confirmation mail 2 times.
How do I resolve this issue?
To resolve this you need to check a few places. What happens most of the time is that a developer while testing will add his or her email to ensure that the checkout process is working properly but they often forget to remove themselves once the project is done.
From the Admin Panel:
If the addresses are not obvious, they are most likely buried in additional store views for the above instructions.
Please write back in the comments bellow this post if this does not resolve your issue.