After the creation of a 
contact form you can make sure that the fields entered by the user are sent via email in a 
precise order.
To do this you have to:
    
- enter the block you've inserted the contact form in
 
- insert an hidden field  in the form in the form
- set propertiesParams as its name
- as value, you'll have to insert the list of the field names you've put in the form, separated by commas
    
- click on Ok to apply the changes.