This PowerShell script checks that a file has been modified on today's current date and sends an email with success or failure.

checkFileForModifiedDate.ps1

$filename = "C:\folder\file.TXT"
$success = "$filename has been modified today. The file is good."
$failure = "!!!ERROR!!! $filename has not been modified today. Server may have not received a file!!!"

if (Test-Path $filename) {
if ((Get-Item $filename).LastWriteTime -ge (Get-Date).Date) {

#Email success to admin
$transcript = $success
$transcript = $transcript | Out-String
$PSEmailServer = "mailrelay.contoso.com"
Send-MailMessage -From "IT <it@contoso.com>" -to "John Doe <John.Doe@contoso.com>","Jane Doe <Jane.Doe@contoso.com>" -Subject "Modified File" -Body $transcript

}

else {

#Email success to admin
$transcript = $failure
$transcript = $transcript | Out-String
$PSEmailServer = "mailrelay.contoso.com"
Send-MailMessage -From "IT <it@contoso>" -to "John Doe <John.Doe@contoso.com>","Jane Doe <Jane.Doe@contoso.com>" -Subject "Modified File" -Body $transcript

}

}