How to disable the detect contact automatically function of Mail in El Capitan OS X 10.11

The function is amazing. But.

But if you have a company directory App already. And you want to keep the OS X Contact App only for friends and family. Then you probably want to disable this function.

Mail App in El Capitan can automatically detect the email addressed you didn’t add to your Contacts.

And if you look through the preference of Mail, there is no place to switch this on/off. So you go to Contacts preference. And you find this guy:

Yes, after you uncheck this box, the automatically detect unsaved contacts function is disabled.

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