Exchange Connection Problems

Is the Outlook Autodiscover Redirect to autodiscover-s.outlook.com Safe?

Guest Writer Sep 29, 2026 868 views

Question details

The user wants to know if the Outlook warning prompt regarding an Autodiscover redirect to autodiscover-s.outlook.com is safe to approve.

Is the Outlook Autodiscover Redirect to autodiscover-s.outlook.com Safe?

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Configuring or connecting an email account in Outlook and encountering an Autodiscover redirect warning.
Observed behavior: Outlook displays a security warning message asking the user whether to allow an Autodiscover redirect to autodiscover-s.outlook.com to configure server settings.

Before you start

Before approving or denying the redirect, verify whether your email account is hosted on Microsoft 365 or Exchange Online by checking with your email provider or IT administrator.

Solution 1Recommended

Approve the Redirect for Trusted Microsoft 365 Accounts

Allow the connection if you are setting up a legitimate Microsoft 365 or Exchange Online account and trust the managing organization.

The server autodiscover-s.outlook.com is an official, legitimate Microsoft endpoint. Outlook uses it to securely obtain your email account settings. If your organization relies on Microsoft 365, this prompt is expected behavior.

Verify your email host

Confirm that your email address is currently hosted on Microsoft 365 or Exchange Online.

Check the prompt details

Ensure the server URL displayed in the warning dialog exactly matches 'autodiscover-s.outlook.com' with no spelling variations.

Allow the redirect

Check the box that says 'Always use my response for this server' if you wish to prevent future warnings, then click 'Allow' or 'Yes' on the prompt.

Approve the Redirect for Trusted Microsoft 365 Accounts

Legitimate Microsoft Server: Approving this request for verified Microsoft 365 accounts allows Outlook to securely finalize your email profile configuration.

Solution 2

Deny the Redirect for Unknown Organizations

Block the connection if you do not recognize the organization or do not use Microsoft 365 for your email.

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Frequently Asked Questions

What is the Autodiscover service in Microsoft Outlook?

Autodiscover is an automated service in Outlook that locates your mailbox server settings using only your email address and password. It retrieves the necessary XML files to configure your profile, making the setup process quick and seamless.

Why does Outlook try to redirect to autodiscover-s.outlook.com?

Outlook attempts to redirect to this specific server when it detects that your email address is hosted on Microsoft 365 or Exchange Online. The server provides the correct connection settings required to link your mailbox to the Outlook desktop client.

How can I permanently stop the Autodiscover redirect warning from appearing?

If you trust the server, simply check the box labeled 'Always use my response for this server' in the warning prompt before you click Allow. This registers the server as a trusted endpoint for future account synchronizations.

Can a malicious server use an Autodiscover redirect to steal credentials?

Yes, which is exactly why Outlook displays a warning by default. While autodiscover-s.outlook.com is an authentic Microsoft domain, you should always double-check the URL shown in the prompt to ensure it hasn't been spoofed by an unauthorized third party.

Outlook & Email Problems