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Firewall rules for On-Prem Exchange server in Hybrid Office365 environment

    Question

  • Can the on-prem exchange server in a hybrid deployment be locked down at the firewall to just Microsoft IPs going both in and out?

    Nothing that I know of connects externally to this server besides Office365.

    What all ports are needed, HTTPS, SMTP, HTTP???

    Thanks.

    Monday, May 07, 2018 5:27 PM

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