Also received such a mail, headers also look fishy (terms-google.com?)
If it wasn't betcoin, they did a good job immitating Betcoin Jessicas writing style.
Example:
In an attempt to be more responsive, yet still keep customer support inquires at the site
www.betcoin.ag/support we are wondering if this is a complaint or how to respond here? Should we not have thank a poster after a certain time period? May we point out that you are commenting on a post from over 2 months ago as well.
Email:
We are fixing the cases of unauthorized access to user accounts Betcoin and funds theft.
If you want to protect your account, you need to change password of your Betcoin account and make client update ....