The default email setting for your website is entered in Global Settings > Email.  

In some cases, you many want to override this setting.  Here is a list of places of may want to enter a different email.  In all cases, this will override the email address in Global Settings > Email. 

• Website > Forms
  You may specify an email on an individual form in the delivery tab.
   
• Global Settings > Article
  If you have comments enabled for articles, you may specify an email in Global Settings just for this purpose. 
   
• Global Settings > Event
  You may specify an email for events. 
   
• Global Settings > Product
  You may specify an email for products.