There was no hack attempt. Dont worry about these emails. As explained, all someone did was put your username in the « Recovery password » screen, sending you the email. There is 0 things he can do with that.
When someone tries to reset your password 3 times from same IP address I call that a (stupid) hack attempt.
Read the answer from TryNinja, someone just teases you and wants to scare you, there is no real danger in the sense that someone can hack your account. To do this, he/she would first have to hack your email or your forum password, and even if someone has managed to do something like that if you have a signed BTC address access, the account will be returned to you.
One user is also have hacked account from Turkey (but this time really hacked) :
https://bitcointalk.org/index.php?topic=5217251.0Also, IP from Turkey does not mean that it is really about someone from that country, it can be VPN/proxy IP.