Mail.Read is an OAuth permission commonly used in Microsoft Graph and other APIs to allow applications to access and read a user’s email messages. When a user or administrator grants this permission, the application can retrieve the contents, metadata, and attachments of emails in the user’s mailbox. This permission is often requested by productivity apps, email clients, or automation tools that need to analyze, display, or process email data. Granting Mail.Read does not allow the application to send, delete, or modify messages - only to read them. It is important to review and understand the scope of this permission before granting it, as it involves access to potentially sensitive personal or organizational information.