Maintaining a Healthy Marketing Database

In the "Unsupress Marketing" campaign example, it doesn't actually handle "Closed/Won" OR "Closed/Lost" as the "Closed/Lost" criteria isn't set.

I have a question here on manage invalid emails. If any lead will update their his/her email address then new lead will be created. By default it is not marked as invalid the why we need this step?

If any lead will update their his/her email address then new lead will be created.

Why would you think so?  An update is just that, an update, and it can come in via many channels.

A form post with a new email address will create a new lead, but that's not the only way for data values to be changed.

In any case please open a new thread in Products​ as this isn't the best place for tech questions.

Thanks @Sanford Whiteman​! I will read the product doc again for better understating.