If you have a good wallet security system the hackers will have trouble if want to break the wallet we have, but the hackers could have known the password we have from the email, and this is only one way of many ways that hackers can do, they are very reliable to breaking anything. so we should really attention to our wallet security, especially if we have a lot of bitcoin in our wallet. my advice we can make Bitcoin Paper Wallets, the type of Bitcoin wallet in offline form so it is very safe from hacker attacks.