This is Vicky from Trulia. You can manage your email alerts at the 'My Searches & Email Alerts' page. In detail:
1. Click on the 'My Trulia' link located on the top right of the page
2. Click on 'My Searches & Email Alerts' link
3. Click on 'My Trulia Voices alerts' tab
From that page you can edit existing or set new email alerts. You can select category, location and frequency in which you want to be notified for new questions.
hope it helps! Let us know if you need any more info
Enjoy Trulia Voices