To manage email alerts access the Email Preferences section of your account. From this page you can mange alerts for your Saved Searches, Homes You're Following, Trulia Advice, and other Trulia subscriptions. Within each of these sections you can update your alert frequencies, or remove alerts that you no longer wish to receive. You can also setup new alerts with your desired specifications at the bottom of each alert page.
Hope this helps,
The "Home" Team-Bozeman Montana
Prudential Montana Real Estate