webforms email

I was trying to find some form of documentation on how to leave out empty fields in the email form. I tried several variations and they all threw errors or left out the incorrect fields. I'm using Webforms on D7, so if anybody can lead me in the right direction, it would be appreciated. All of the fields that can be left out if blank are textareas if that helps. Here are the pages I looked at previously:

http://drupal.org/node/705004
http://drupal.org/node/347361