Emailing a Hard Drive Disk Space Alert Using Powershell - email

Question

I've been browsing the web trying to find a way if possible to email a low disk space alert from a Gmail account to a shared mail box using power shell but Im struggling with a query I've managed to piece together.
$EmailFrom = "FromEmail#Gmail.com"
$EmailTo = "ToEmail#Gmail.com"
$SMTPServer = "smtp.gmail.com"
$SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 587)
$SMTPClient.EnableSsl = $true
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential("Username", "Password");
$Computers = "Local Computer"
$Subject = "Disk Space Storage Report"
$Body = "This report was generated because the drive(s) listed below have less than $thresholdspace % free space. Drives above this threshold will not be listed."
[decimal]$thresholdspace = 50
$tableFragment = Get-WMIObject -ComputerName $computers Win32_LogicalDisk `
| select __SERVER, DriveType, VolumeName, Name, #{n='Size (Gb)' ;e={"{0:n2}" -f ($_.size/1gb)}},#{n='FreeSpace (Gb)';e={"{0:n2}" -f ($_.freespace/1gb)}}, #{n='PercentFree';e={"{0:n2}" -f ($_.freespace/$_.size*100)}} `
| Where-Object {$_.DriveType -eq 3} `
| ConvertTo-HTML -fragment
$regexsubject = $Body
$regex = [regex] '(?im)<td>'
if ($regex.IsMatch($regexsubject)) {$smtpclinet.send($fromemail, $EmailTo, $Subject, $Body)}
Script runs but nothing happens, any help would be fantastic!!!

Answer 1

My version would be longer because I'd have made a substitute for Send-MailMessage such that swapping between mine and Send-MailMessage is trivial.
This is one possible way of doing it. There are good uses for the Fragment parameter on ConvertTo-Html, but not much of a justification to do so here.
This is a script and expected to be a .ps1 file. Mandatory things I don't really want to hard-code beyond a default are set in the param block.
param(
[String[]]$ComputerName = $env:COMPUTERNAME,
[Decimal]$Theshold = 0.5,
[PSCredential]$Credential = (Get-Credential)
)
#
# Supporting functions
#
# This function acts in much the same way as Send-MailMessage.
function Send-SmtpMessage {
param(
[Parameter(Mandatory = $true, Position = 1)]
[String[]]$To,
[Parameter(Mandatory = $true, Position = 2)]
[String]$Subject,
[String]$Body,
[Switch]$BodyAsHtml,
[String]$SmtpServer = $PSEmailServer,
[Int32]$Port,
[Switch]$UseSSL,
[PSCredential]$Credential,
[Parameter(Mandatory = $true)]
[String]$From
)
if ([String]::IsNullOrEmtpy($_)) {
# I'd use $pscmdlet.ThrowTerminatingError for this normally
throw 'A value must be provided for SmtpServer'
}
# Create a mail message
$mailMessage = New-Object System.Net.Mail.MailMessage
# Email address formatting si validated by this, allowing failure to kill the command
try {
foreach ($recipient in $To) {
$mailMessage.To.Add($To)
}
$mailMessage.From = $From
} catch {
$pscmdlet.ThrowTerminatingError($_)
}
$mailMessage.Subject = $Subject
$mailMessage.Body = $Body
if ($BodyAsHtml) {
$mailMessage.IsBodyHtml = $true
}
try {
$smtpClient = New-Object System.Net.Mail.SmtpClient($SmtpServer, $Port)
if ($UseSSL) {
$smtpClient.EnableSsl = $true
}
if ($psboundparameters.ContainsKey('Credential')) {
$smtpClient.Credentials = $Credential.GetNetworkCredential()
}
$smtpClient.Send($mailMessage)
} catch {
# Return errors as non-terminating
Write-Error -ErrorRecord $_
}
}
#
# Main
#
# This is inserted before the table generated by the script
$PreContent = 'This report was generated because the drive(s) listed below have less than {0} free space. Drives above this threshold will not be listed.' -f ('{0:P2}' -f $Threshold)
# This is a result counter, it'll be incremented for each result which passes the threshold
$i = 0
# Generate the message body. There's not as much error control around WMI as I'd normally like.
$Body = Get-WmiObject Win32_LogicalDisk -Filter 'DriveType=3' -ComputerName $ComputerName | ForEach-Object {
# PSCustomObject requires PS 3 or greater.
# Using Math.Round below means we can still perform numeric comparisons
# Percent free remains as a decimal until the end. Programs like Excel expect percentages as a decimal (0 to 1).
[PSCustomObject]#{
ComputerName = $_.__SERVER
DriveType = $_.DriveType
VolumeName = $_.VolumeName
Name = $_.Name
'Size (GB)' = [Math]::Round(($_.Size / 1GB), 2)
'FreeSpace (GB)' = [Math]::Round(($_.FreeSpace / 1GB), 2)
PercentFree = [Math]::Round(($_.FreeSpace / $_.Size), 2)
}
} | Where-Object {
if ($_.PercentFree -lt $Threshold) {
$true
$i++
}
} | ForEach-Object {
# Make Percentage friendly. P2 adds % for us.
$_.PercentFree = '{0:P2}' -f $_.PercentFree
$_
} | ConvertTo-Html -PreContent $PreContent | Out-String
# If there's one or more warning to send.
if ($i -gt 0) {
$params = #{
To = "ToEmail#Gmail.com"
From = "FromEmail#Gmail.com"
Subject = "Disk Space Storage Report"
Body = $Body
SmtpServer = "smtp.gmail.com"
Port = 587
UseSsl = $true
Credential = $Credential
}
Send-SmtpMessage #params
}