Packet tracing

I'm not sure if that is the correct Title "Packet Tracing" but this is what I would like to implement:

I need to make sure that our data flow, specifically our email flow, is following a certain path, or I should say to find out what path it comes in and out of our network. For example, when email enters our network we want to make sure that it flows seamlessly in a correct manner as well as when it leaves our network, not looping around, getting stuck somewhere, etc..
We have intermittent email problems every now and then(duplicate emails) and our network can be a little in depth so I want to know if there is a way I can follow email traffic and see the actual path it takes from the client to the gateway and vice versa. Even if email is flowing fine and that isnt the problem I would still like to know the flow of our traffic. I would like to see some sort of report I can look at to see all the different devices it stops at etc..
Thanks!
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tolinromeAsked:
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JAN PAKULAConnect With a Mentor ICT Infranstructure ManagerCommented:
use this http://www.wireshark.org/download.html to monitor packets

Jan MA CCNA
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tpl415Commented:
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