Is there any way for me not to get an email notification whenever someone responds to a thread I’m in by default, and not to get an email notification when I get a PM?

It’s in your control panel.

Your Control Panel > Email Settings > []Enable Smart Notification.  Uncheck it.

Thanks, Aerik.

Humm, I unchecked mine but I’m still getting them. What’s up with that?

Okay, don’t forget to uncheck the box “Notify me via email when someone posts in this thread”