Incoming Email (Mails only related to CRM and not all mails)

Hi All,
I have Deployed ERPNext now I am in the process of Integrating Email into It.
The question I have is:

  1. Communication Trail in lead shows the outgoing mail, does it also show incoming mail for that specific lead?
  2. Does ERPNext will fetch all the emails? The requirement is it should fetch only mails that are meant for CRM and not all. Is it Possible?