Autodiscover.mail.onmicrosoft.com
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autodiscover.mail.onmicrosoft.com is a domain name used by Microsoft for Autodiscover, a feature that helps Outlook clients (such as Outlook, Outlook Web App, and mobile devices) automatically configure their settings to connect to a Microsoft 365 or Office 365 organization.
Here's what Autodiscover does:
- Discovery: When an Outlook client is set up, it sends a request to the Autodiscover service to discover the organization's settings, such as the mail server, authentication settings, and other configuration details.
- Configuration: The Autodiscover service responds with the necessary configuration settings, which the Outlook client uses to establish a connection to the organization's mail server.
The autodiscover.mail.onmicrosoft.com domain is used by Microsoft to provide Autodiscover services for organizations that have a Microsoft 365 or Office 365 subscription. This domain is used to redirect the Autodiscover requests to the organization's own Autodiscover service, which is usually hosted on the organization's own domain (e.g., autodiscover.contoso.com).
When an Outlook client requests Autodiscover information, it sends a request to autodiscover.mail.onmicrosoft.com, which then redirects the request to the organization's own Autodiscover service. The organization's Autodiscover service then responds with the necessary configuration settings, allowing the Outlook client to connect to the organization's mail server.
In summary, autodiscover.mail.onmicrosoft.com is a Microsoft-provided domain that helps Outlook clients discover and configure their settings to connect to a Microsoft 365 or Office 365 organization.