Frage WSUS Cleanup Script

PS C:\Program Files\Scripts> C:\Program Files\Scripts\WSUS-Cleanup.ps1
Ausnahme beim Aufrufen von "Send" mit 1 Argument(en):  "Fehler beim Senden von Mail."  
In C:\Program Files\Scripts\WSUS-Cleanup.ps1:62 Zeichen:1
+ $mailer.Send($message)
+ ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) , MethodInvocationException
    + FullyQualifiedErrorId : SmtpException

# Mail the report...
$message = new-object Net.Mail.MailMessage
$mailer = new-object Net.Mail.SmtpClient($SMTPServer)
 
$message.From = "S-V-WSUS Cleanup <s-v-wsus@meinmailserver.local>"  
$message.To.Add("Henner <henner@meinmailserver.local>")  
$MeinText = "WSUS - Server CleanUp Bericht " + $WSUSServer  
$message.Subject = $MeinText
$message.Body = [string]::join([environment]::NewLine, (get-content $logfile))
$mailer.Send($message)