switch off automatic contact creation

I have noticed that if I receive (or reply) to an email, then em client will automatically create a contact. Is there any way to switch this off?
I am using v7.0.x

Go to menu/tools/settings/mail/compose and un-check “Store composed mail receipts for suggestion”. You can also clear the history directly below this option.

Hi Jay, thanks for this. I do want the auto-completion when I enter an address in a new email but I do not want the business card in contacts everytime I receive an email or reply to one.
Have switched it off so hopefully that will solve the problem.