Yes, in fact there is!
1. In the upper right next to the Log Out button, click Settings.
2. In the new window that opens, there should be a column on the left hand side with many squares that say things like "My Messages" and "My Subscriptions". Scroll down until you see an option to click on that reads "General Settings".
3. This will open up a bunch of settings to adjust. If you scroll down a bit until you find a header that reads "Messaging and Notification". Inside there is a Subhead that says "Default Thread Subscription Mode". Click that drop down and pick which one you like!
The first one will make it so you get zero notifications. The second will allow you to show only threads you've posted in. The third, fourth, and fifth are all varying options for receiving emails notifying you that someone has posted.
Hope this helps!
🙂