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Kavindu Asanga Dayananda's avatar
Kavindu Asanga Dayananda
Copper Contributor
Feb 21, 2023

Block Outlook externally - Exchange Online/On-Premises

Hi

 

We have a hybrid (Exchange 2016) with Exchange Online and wants to block/restrict users connecting Outlook, outside of our network.

 

What options do we have to achieve this?

 

Regards,

Kavindu

 

  • Dan_Snape's avatar
    Dan_Snape
    Steel Contributor
    If your mailboxes are in Exchange Online, then the best option is Conditional Access. Pretty much the whole idea of cloud services is that you can access them from anywhere. If the mailboxes are on-premises, it should be simple to block access to Exchange from outside your network
      • Dan_Snape's avatar
        Dan_Snape
        Steel Contributor
        The simplest is to block any traffic destined for Exchange servers at the perimeter firewall

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