how to block external access to OWA and MAPI

Question

how to block external access to OWA and MAPI

Answer 1

 

Hi @ xhope,

You can install the IP and Domain Restriction Role and restrict external access to OWA or MAPI through IIS configuration.

 

For detailed instructions, you can refer to the article below:
Disable external access to ECP in Exchange Server
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)

 

In addition, if you have a firewall configured in your environment, you can check if it supports blocking traffic entering the specified link (for example: https://mail.contoso.com/owa)?

This method can also prevent users from external accessing OWA or MAPI.

 

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