Allow This Website To Configure Server Settings
If we use DNS SRV record for Autodiscover, you may get the message “Allow This Website To Configure Server Settings” while opening the Outlook. The detail mentions:
“Your account was redirected to this website for settings. You should only allow settings from sources you know and trust.”
It appears because Outlook has found the SRV record for Autodiscover that is configured for mail.domain.com. The complete SRV record is _Autodiscover._tcp.domain.com. The complete URL for Autodiscover also appears in this notification. This warning message is expected and we can ignore it by clicking Allow.
Fix for a Single User:
To automatically ignore this warning message for a user, we need to add a registry entry on the User’s PC depending on the Outlook version.
Go to the related path and create new string value with the name of the Server we are redirecting in SRV record, for example mail.domain.com.
Close the registry and you will no longer get this prompt again for this user.
Fix for multiple users through Group Policy:
If you want to push this registry entry through group policy, you can create a new group policy object and link it to the Users OU. Browse to “User Configuration\Preferences\Windows Settings\Registry” and create new registry item with the following settings:
Key Path: Software\Microsoft\Office\15.0\Outlook\AutoDiscover\RedirectServers
Value name: mail.domain.com
Value type: REG_SZ
If users have different Outlook versions, then you have to create Registry key for each Outlook version. By just changing the path.
For example for Outlook “Software\Microsoft\Office\15.0\Outlook\AutoDiscover\RedirectServers” for Outlook 2013 and “Software\Microsoft\Office\16.0\Outlook\AutoDiscover\RedirectServers” for Outlook 2016 and so on.