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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)
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