## 1. Start this script running in PowerShell
## 2. Close your laptop lid. The next time the lid opens, the script will send a mail.

$lastAwake = Get-Date; while($true) {
    Start-Sleep -Seconds 1
    $now = Get-Date
    if(($now - $lastAwake).TotalSeconds -gt 3) {
        $params = @{
            To = 'user@example.com'
            From = 'user@example.com'
            Subject = 'Evil maid detected!'
            Body = "Detected laptop opened at $now"
            SmtpServer = 'smtp@example.com'
        }
        Send-MailMessage @params
    }
    $lastAwake = $now
}