And i you want all to stop, click your name at the top right, then go to preferences. You'll see the options to automatically get email alerts and you can turn that off.
Just so you know, you can set it to only alert for certain things. I think there are like 5 options you can select. Like None2Slow said,.... Hover over your user name in the upper right corner until the dropdown box appears. Choose "Alert Preferences". It will list 5 different options:
Alert when someone:
Replies to a watched thread
Attaches a file to a watched thread
Quotes your message
Mentions you in a message
Likes your message
Click the boxes to the left of which ones you want alerts for and you're good
