Send-MailMessage: Cannot validate argument on parameter 'Subject'

Question

This error appears when running the script below:

Send-MailMessage : Cannot validate argument on parameter \'Subject\'. The argument is null or empty. Pro

Answer 1

My guess would be that $Attachment = Get-ChildItem -Path $dir -Filter "*$($Region.Name)*" -Recurse is not returning any files for one or more of the regions, so $Subject ends up being $null.

You could either check for that state and perhaps throw a warning instead of attempting to send the mail, or another way to work around the error (and get an email sent but with a blank subject) would be to add some other (guaranteed) text to $subject. E.g:

$Subject = "$($Region.Name): $AttachmentName"

Although then I suspect it would complain about -Attachments being null.

To add a check/throw warning, you could do the following:

foreach ($Region in $Regions) {
    $Attachment = Get-ChildItem -Path $dir -Filter "*$($Region.Name)*" -Recurse

    If ($Attachment) {

        $AttachmentName = $Attachment.BaseName
        $Subject = "$AttachmentName"
        $Body = "Please find attached the Report for $($Region.Name).

    Produced @ $Time 

    Regards,
    John Doe
    "
        Send-MailMessage -From $Region.From -To $Region.To -CC $Region.Cc -Subject $Subject -Body $Body -SmtpServer $SMTPServer -Attachments $Attachment.FullName
        $Attachment | Move-Item -Destination "C:\Users\user\Desktop\Lists\oldLists"
    } Else {
        Write-Warning "One or more files named $($Region.Name) were not found in $dir. Mail not sent."
    }
}