At the start of the day normally around 6am GMT a task email reminder is sent out for any tasks which are due that day.  

The email is sent to the email address linked with your CRM account user profile and is sent from our support email:  support@

Here is an example of an email task reminder:  

You will see a column that mentions associated with - this it the contact/client details and you can click on the link and it will take you to the contact record.  If you set a time against the task then this will display in the first column.

If your task has a time associated with it then another task email reminder will be sent to you by default 1 hour before the task is due.