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+# Email notification for unknown sign-ins
+
+When a user successfully signs in from a previously unknown IP address,
+GitLab notifies the user by email. In this way, GitLab proactively alerts users of potentially
+malicious or unauthorized sign-ins.
+
+There are two methods used to identify a known sign-in:
+
+- Last sign-in IP: The current sign-in IP address is checked against the last sign-in
+ IP address.
+- Current active sessions: If the user has an existing active session from the
+ same IP address. See [Active Sessions](active_sessions.md).
+
+## Example email
+
+![Unknown sign in email](./img/unknown_sign_in_email_v13_0.png)