Serverseitige Outlook-Regel zur Weiterleitung des Betreffs an eine Externe E-Mail-Adresse

# ===== START VARS =====
# Mailbox dessen Posteingang zu überwachen ist
$global:USERNAME = 'USERNAME'  
$global:PASSWORD = 'PASSWORT'  
# E-Mail an die der Betreff jeder Mail weitergeleitet wird
$global:TARGETMAIL = 'externaluser@domain.tld'  
# Exchange-Server FQDN
$global:EXSERVER = 'SERVERXYZ.DOMAIN.TLD'  
# ===== END VARS =====

$global:CONNECTIONTIMEOUT = 30

if ($PSVersionTable.PSVersion.Major -lt 3){write-host "ERROR: Minimum Powershell Version 3.0 is required!" -F Yellow; return}    

# EWS DLL laden
Add-Type -Path "$PSScriptRoot\Microsoft.Exchange.WebServices.dll"  

Get-EventSubscriber | Unregister-Event -Force

# Allen Zertifikaten vertrauen
Add-Type @"  
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@  
# Trust all certs policy dem ServicePointManager zuweisen
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

# EWS Objekt erstellen
$global:ews = new-object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP2)
$global:ews.Url = "https://$global:EXSERVER/ews/exchange.asmx"  
# Benutze die Credentials mit dem das Skript ausgeführt wird
$global:ews.UseDefaultCredentials = $false
$global:ews.Credentials = new-object System.Net.NetworkCredential($global:USERNAME,$global:PASSWORD)

$global:subscription = $global:ews.SubscribeToStreamingNotifications([Microsoft.Exchange.WebServices.Data.FolderId[]](New-Object Microsoft.Exchange.WebServices.Data.FolderId ([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox)),[Microsoft.Exchange.WebServices.Data.EventType]::NewMail)
$global:connection = New-Object Microsoft.Exchange.WebServices.Data.StreamingSubscriptionConnection($global:ews,$global:CONNECTIONTIMEOUT)

# Event das beim Eintreffen einer/mehrerer neuer Mails ausgeführt wird
Register-ObjectEvent $global:connection -EventName OnNotificationEvent -SourceIdentifier NewMailNotification -Action {
    write-host "NewMail subscription event received." -F Green  
    # Alle eingetroffenen Mails verarbeiten
    $Event.SourceEventArgs.Events | %{
        # Mail-Details mit übermittelter ItemId abrufen
        $mail = [Microsoft.Exchange.WebServices.Data.EmailMessage]::Bind($global:ews, $_.ItemId)
        # Wenn die Mail gefunden wurde ...
        if ($mail){
            # lade Details der Mail
            $mail.Load()
            $m_from = $mail.From.Address
            $m_to = ($mail.ToRecipients | %{$_.Address}) -join ', '  
            write-host "Forwarding Mail with Subject '$($mail.Subject)' to '$($global:TARGETMAIL)'" -F Green  
            # create forward message
            $mail_fwd = $mail.CreateForward()
            # externen Empfänger festlegen
            $mail_fwd.ToRecipients.Add($global:TARGETMAIL)
            # Body mit Info ersetzen
            $mail_fwd.Body = "Received mail with Subject '$($mail.Subject)' from sender: '$m_from' to Recipient(s): '$m_to'"  
            # mail senden
            $mail_fwd.Send()
        }
    }
}

# Event das beim Disconnect der Verbindung ausgeführt wird (Verbindung wird dann erneut hier wiederhergestellt)
Register-ObjectEvent $global:connection -EventName OnDisconnect -SourceIdentifier OnDisconnectNotification -Action {
    write-host "Subscription-Connection disconnected, restarting connection ... " -F Yellow -NoNewline  
    while(!$global:connection.IsOpen){
        $global:connection.Open()
    }
    write-host "Connected." -F Green  
}

# Subscription erstellen
$global:connection.AddSubscription($global:subscription)
# Subscription öffnen
$global:connection.Open()


write-host "Waiting for new events ..." -F Green  
while($true){
    sleep 1
}