SMTP - Kriege andauernt Spam Mails

Hallo Elitepvpers,

sobald ich einen Mail Server einrichte (Ohne �berhaupt eine E-Mail selbst eingerichtet habe) bzw. sobald SMTP Dienst ausgef�hrt wird, bekomme ich im Sekunden Takt Spam E-Mails.
Ich wei� keinen Grund hierf�r.

Informationen:
Betriebssystem: Windows Server 2012 R2 (64 Bit)
Software: IIS (Windows Features)
E-Mail Beispiel:

Spoiler

Quote:

Received: from 178.32.145.202 ([114.45.22.182]) by WIN-ZarnOrend.orenda.ovh with Microsoft SMTPSVC(8.5.9600.16384);
Thu, 27 Nov 2014 16:29:17 +0100
Received: from 155.64.241.196 by ; Thu, 27 Nov 2014 16:28:03 +0100
Message-ID: <[Only registered and activated users can see links. Click Here To Register...].tw>
From: "★夜世界情趣用品★Kristin" <[Only registered and activated users can see links. Click Here To Register...]>
Reply-To: "▲成人情趣用品▲Kristin" <[Only registered and activated users can see links. Click Here To Register...]>
To: [Only registered and activated users can see links. Click Here To Register...]
Subject: ▄數位微調高潮按摩棒▄Kristin
Date: Thu, 27 Nov 2014 21:26:03 +0600
X-Mailer:
MIME-Version: 2.0
Content-Type: multipart/alternative;
boundary="--104838575380208993"
X-Priority: 3
X-MSMail-Priority: Normal
Return-Path: [Only registered and activated users can see links. Click Here To Register...]
X-OriginalArrivalTime: 27 Nov 2014 15:29:17.0542 (UTC) FILETIME=[E859F860:01D00A56]

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Hab mal den Ordner hochgeladen (Mit paar E-Mails)!
[Only registered and activated users can see links. Click Here To Register...] (Nichtmal 1 MB Gro�)

Wisst ihr wie ich diese Spam Mails blockiere?

PS: Habt ihr Vorschl�ge als Alternative um E-Mails zu empfangen, ich w�rde ja Froxlor nehmen aber ist leider nur f�r Linux vorhanden.

Mit freundlichen Gr��en, ZarneXxX.