Turn off confirmation emails
Turning off email confirmations is a snap and you can control this option on an individual form level. So if you want some forms to have email confirmations and others not, its simple.
First, click edit next to the campaign you want to manage. Then click over to the confirmation tab. About mid way down the page you see the various email confirmation options. Then uncheck the option to send an email confirmation. If you have a payment page that processes recurring payments, you can also turn off the recurring notifications as well. Simple as pie.