# Drives to check: set to $null or empty to check all local (non-network) drives
# $drives = @(“C”,”D”);
$drives = $null;

# The minimum disk size to check for raising the warning
$minSize = 50GB;

# SMTP configuration: username, password & so on
$email_username = “your_username@gmail.com”;
$email_password = “your password”;
$email_smtp_host = “smtp.gmail.com”;
$email_smtp_port = 587;
$email_smtp_SSL = 1;
$email_from_address = “melbournecityit@gmail.com”;
$email_to_addressArray = @(“user1@domain.com”, “user2@domain.com”);

if ($drives -eq $null -Or $drives -lt 1) {
$localVolumes = Get-WMIObject win32_volume;
$drives = @();
foreach ($vol in $localVolumes) {
if ($vol.DriveType -eq 3 -And $vol.DriveLetter -ne $null ) {
$drives += $vol.DriveLetter[0];
}
}
}
foreach ($d in $drives) {
Write-Host (“`r`n”);
Write-Host (“Checking drive ” + $d + ” …”);
$disk = Get-PSDrive $d;
if ($disk.Free / 1MB -lt $minSize) {
Write-Host (“Drive ” + $d + ” has less than ” + $([math]::round(($minSize / 1GB),2)) `
+ ” GBs free (” + $([math]::round(($disk.Free / 1GB),2)) + “): sending e-mail…”);

$message = new-object Net.Mail.MailMessage;
$message.From = $email_from_address;
foreach ($to in $email_to_addressArray) {
$message.To.Add($to);
}
$message.Subject = (“[RunningLow] WARNING: ” + $env:computername + ” drive ” + $d);
$message.Subject += (” has less than ” + $([math]::round(($minSize / 1GB),2)) + ” GBs free “);
$message.Subject += (“(” + $([math]::round(($disk.Free / 1GB),2)) + “)”);
$message.Body = “Hello there, `r`n`r`n”;
$message.Body += “this is an automatic e-mail message “;
$message.Body += “sent by RunningLow Powershell script “;
$message.Body += (“to inform you that ” + $env:computername + ” drive ” + $d + ” “);
$message.Body += “is running low on free space. `r`n`r`n”;
$message.Body += “————————————————————–“;
$message.Body += “`r`n”;
$message.Body += (“Machine HostName: ” + $env:computername + ” `r`n”);
$message.Body += “Machine IP Address(es): “;
$ipAddresses = Get-NetIPAddress -AddressFamily IPv4;
foreach ($ip in $ipAddresses) {
if ($ip.IPAddress -like “127.0.0.1”) {
continue;
}
$message.Body += ($ip.IPAddress + ” “);
}
$message.Body += “`r`n”;
$message.Body += (“Used space on drive ” + $d + “: ” + $([math]::round(($disk.Used / 1GB),2)) + ” GBs. `r`n”);
$message.Body += (“Free space on drive ” + $d + “: ” + $([math]::round(($disk.Free / 1GB),2)) + ” GBs. `r`n”);
$message.Body += “————————————————————–“;
$message.Body += “`r`n`r`n”;
$message.Body += “This warning will fire when the free space is lower “;
$message.Body += (“than ” + $([math]::round(($minSize / 1GB),2)) + ” GBs `r`n`r`n”);
$message.Body += “`r`n”;
$message.Body += ” “;

$smtp = new-object Net.Mail.SmtpClient($email_smtp_host, $email_smtp_port);
$smtp.EnableSSL = $email_smtp_SSL;
$smtp.Credentials = New-Object System.Net.NetworkCredential($email_username, $email_password);
$smtp.send($message);
$message.Dispose();
write-host “… E-Mail sent!” ;
}
else {
Write-Host (“Drive ” + $d + ” has more than ” + $([math]::round(($minSize / 1GB),2)) + ” GBs free: nothing to do.”);
}
}