Tool to track

Hi,

What are the free tools available in tracking an email.

Scenarios:

1- Exchange Server to Exchange Server(inside domain)(2 Mailbox severs(2013))

2- Exchange Server to Office 365(Hybrid setup)- Not the email tracking of Exchange admin center.

3- Exchange Server to outside domain like gmail(once the mail handed over to Exchange Server edge transport to outside any server if that does not reach gmail, where do we check)

Thank you.