KB0150- Domain names and ports that should be opened for OnePlaceMail App



OnePlaceMail for Outlook App



When attempting to sign in, you are presented with the following error:

Firewall message





Please contact your network administrator to add the following domain names and ports as an exception or whitelist them in your organization firewall:

  • *.oneplaceapps.net
  • Port 443 (HTTPS protocol)

We recommend that you use * to enable everything from oneplaceapps.net.

If you don't want to use * to enable everything from oneplaceapps.net, you can add the following list of service names as an exception/whitelist in your firewall:


Should you choose this approach, please keep checking this page for additional endpoints in the future.

Without access to those endpoints, you will be unable to use the OnePlaceMail App. This means your users will not be able to access their subscription and save files to SharePoint.

If you have added the domain names above as an exception or whitelisted them in your firewall and you still are unable to use OnePlaceMail, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.


Posted in App for Outlook

OnePlaceMail App

Seamless integration from Microsoft Outlook to SharePoint and Teams.

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