As I stated above, I have a unique email for direcTV (now closed). It is DirecTV that shared our email with HBO. Likely to market to us. I will disable that email as I no longer have DirecTV. The email they sent this to was only used for my DirecTV account and for nothing else. This is why I am confident that DirecTV (AT&T) shared this...
I don't have a direct TV account nor have I ever used any kind of a TV cable service. I also don't use AT&T so I'm not sure. Because I also got the email.