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Original KB number: 3206915
Symptoms
When Microsoft Outlook for Mac connects to a Microsoft 365 account, the Autodiscover service is redirected from HTTP to HTTPS, and you might receive a warning message that resembles the following example:
Outlook was redirected to the server
Autodiscover-s.outlook.comto get new settings for your accountuser@___domain.com. Do you want to allow this server to configure your settings?
https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml
Click Allow only if you fully trust the source, or if your Exchange administrator instructs you to.
When this warning message displays, you can select Always use my response for this server, and then select Allow to not be asked about this specific server again for the current Outlook for Mac profile.
Resolution
If you want to suppress the initial warning message, use the following steps.
Quit Outlook if it's running.
Open Terminal using one of the following methods:
- With Finder as the selected application, on the Go menu select Utilities, and then double-click Terminal.
- In Spotlight Search, type Terminal, and then double-click Terminal from the search results.
Enter the following command in the Terminal window, and then press Enter.
defaults write com.microsoft.Outlook TrustO365AutodiscoverRedirect -bool trueOn the Terminal menu, select Quit Terminal.
More information
The TrustO365AutodiscoverRedirect preference can be configured to use the following values:
| Boolean Setting value | Description |
|---|---|
| true | Don't prompt for trusted Microsoft 365 endpoints. Outlook defines what URLs are trusted and it isn't configurable. |
| false | Outlook uses the default behavior that is to prompt when Autodiscover Redirects occur. |
| if value isn't present | Outlook uses the default behavior that is to prompt when Autodiscover Redirects occur. |