That'd be a breech of privacy I imagine (no need to tell everyone who did get breached), and if you didn't get contacted yet then it wasn't you.
Email is only in danger if you don't change the email password assuming it was the same as your forum one in the first place. If it was the same, change it to something significantly different.
Email is only in danger if you don't change the email password assuming it was the same as your forum one in the first place. If it was the same, change it to something significantly different.