Not getting email notifications

For a couple years now I haven't been getting email notifications for thread responses and private messages. I've managed this issue by checking the forum often, but if I forget to check I'll never know that I received a private message, or a response on a thread. My e-mail address is correct, and when I do a password reset I do receive that email. It's just the thread response and private messages I don't seem to get email notifications for.

Thanks for your help!
Steve