As most of you know, when you reply to a thread, you will automatically get an e-mail when someone replies to the thread after you. I think if you ignore it and don't click on the link or visit the thread, no more e-mails will be generated.
At any rate, I noticed that Gmail has been sending thread alerts to my spam folder recently. I've marked them "not spam" and they go to my Inbox but then it just happens again. I think if you add the sender e-mail which is "admin@villiersterrace.com" to your contacts, this will whitelist that e-mail address and stop marking them as spam.