High network traffic in Exchange mail server

Dear Experts, we have a Exchange mail server, serving about 1000 users, every morning we see these statistics of send/receive traffic. Is this normal behavior? How can we check the most sending email address?



Env: Exchange 2016, Win server 2012R2

Many thanks!
LVL 4
TjnoNetwork AdministratorAsked:
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Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
It should be normal, 1000 users connecting simultaneously that should be the exchange server serving and updating outlook clients.

The way to inspect the data, it's by a firewall or with a software like wireshark.
https://www.wireshark.org/
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Sam Simon NasserIT Support ProfessionalCommented:
the read and write values are normal, as jose mentioned, 1000 user having connection (send/receive) will give you such readings.
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TjnoNetwork AdministratorAuthor Commented:
Hi, furthermore, it seems like the synchronize process between Exchange server and Outlook client is never end. I always see this in my PC:

 syncOutlook.png
Can you please suggest?
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Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
There's nothing to suggest, it's normal, it happens to me as well in my outlook.
Maybe a bug from the latest updates, outlook 2016
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TjnoNetwork AdministratorAuthor Commented:
But if I keep Outlook client opened, the new emails will not be updated or very slowly. It only comes when I restart MS Outlook?
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