Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I believe e-mail notifications are set on a per-thread basis, so if you had the subscription setting configured to automatically subscribe you to a thread with e-mail notifications in the past, any subscriptions from that time will still send you e-mails.
Select all the threads you want to stop getting e-mails about, scroll to the bottom of the page, pick "No email notification" from the drop-down menu, and click the Go button.