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If the traffic is terminating on your own servers you in no way need deep packet inspection to determine the source of traffic and its nature. Even if the traffic wasn't terminating on your machines, you don't need DPI to determine src and dst ip:port tuples. Which is all you need to do what your suggesting.



My comment isn't about DPI specifically, but a whole range of intrusive monitoring policies at ISPs. In order to determine the originator of an email, you have to read (at least) the email headers. The IP address of the last hop is not that useful in routing email.

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