Your server must be properly configured for Tasks to send e-mails.
If you are not receiving Daily E-mail Reminders, you can check to see if your server is properly configured to send e-mail by using the included e-mail configuration test utility.
Point your browser at:
- Then, enter your e-mail address and press the 'Send Test E-mail' button.
If you don't receive the test e-mail (make sure it didn't get caught by a junk mail filter) your server isn't properly set up to send e-mail.
You'll need to fix this before Tasks can send e-mail reminders.