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on-premise exchange server various roles deployment best practice

Dear Experts
We are in process of implementing on-premise exchange enterprise server, as our userbase is lesser than 25 we are installing following 1 and 2 roles in same server which is behind the firewall
1.Client Access services -
2.Mailbox services
Now please suggest should we have setup one more windows server in DMZ and install Edge Transport role here.
We have also procured barracuda email security on-site appliance.
Please suggest does the Edge Transport role to be setup in DMZ by retaining above 1 and 2 behind the firewall and in our design barracuda email security appliance exists hence Edge Transport role not required, please help in the design, thanks in advance.

ASKER CERTIFIED SOLUTION

Hypercat (Deb)

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Hypercat (Deb)

Regarding your question about the Barracuda, I haven't used Barracuda appliances for quite a while, but this article may help:

https://campus.barracuda.com/product/messagearchiver/doc/18449564/how-to-configure-envelope-smtp-journaling-for-microsoft-exchange-server-2013-and-newer-standard-journaling/?sl=AXBABosO7X_svXEFy5Hr&so=1

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kevinhsieh

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Jeff Glover

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kevinhsieh

Although, with only 25 mailboxes why are you not implementing O365?

Goutham

ASKER

Thanks you all for the inputs, as policy we cannot have mail server on cloud it has to be on_premise, mail server is exchange enterprise 2019, will install all roles in the single sever on VM which will be behind firewall and baracuda appliance in perimeter network, hope this is fine, thanks