Spam blocken von *.xyz (Strato)

[postfix_ml at rirasoft.de]

Hallo zusammen,
auf meinem Mailserver kommen in den letzten Tagen vermehrt Spam Mails 
von Strato durch, die als Domain xyz angeben.
Ich habe schon eine Datei "sender_access" mit dem Inhalt
/\.xyz$/           REJECT Mail from .xyz not accepted
/\.pw$/           REJECT Mail from .pw not accepted
/\.hk$/           REJECT Mail from .hk not accepted

erstellt, und mittels "smtpd_sender_restrictions = 
hash:/etc/postfix/sender_access" eingebunden, aber das hilft auch nicht.

Was kann ich besser machen ?

Gruß
Andreas

Return-Path: <BOUNCE_PREFIX-1454633493.11176.N7HzQ40ZT2sc at rlvip.xyz>
X-Original-To: andreas at rirasoft.de
Delivered-To: andreas at rirasoft.de
Received: from localhost (localhost.localdomain [127.0.0.1])
     by mail.rirasoft.de (Postfix) with ESMTP id 7A34B120483
     for <andreas at rirasoft.de>; Fri, 5 Feb 2016 05:54:44 +0100 (CET)
X-Virus-Scanned: amavisd-new at example.com
Received: from mail.rirasoft.de ([127.0.0.1])
     by localhost (cubietruck.reschke.lan [127.0.0.1]) (amavisd-new, port 
10024)
     with ESMTP id qq97w3kWQGLk for <andreas at rirasoft.de>;
     Fri, 5 Feb 2016 05:54:40 +0100 (CET)
Received: from mail.rlvip.xyz (mail.rlvip.xyz [81.169.225.118])
     by mail.rirasoft.de (Postfix) with ESMTP id 3C5B01206D4
     for <andreas at rirasoft.de>; Fri, 5 Feb 2016 05:54:39 +0100 (CET)
Received: by mail.rlvip.xyz id hmglh0000ds2 for <andreas at rirasoft.de>; 
Fri, 5 Feb 2016 01:53:04 +0100 (envelope-from 
<BOUNCE_PREFIX-1454633493.11176.N7HzQ40ZT2sc at rlvip.xyz>)
DKIM-Signature: v=1; a=rsa-sha256; s=c; d=rlvip.xyz; l=754; 
t=1454633493;
     c=relaxed/relaxed;
     
h=mime-version:content-type:content-transfer-encoding:from:to:subject:message-id:date;
     bh=jZUa4jqDYX/+/X29btCQwUDB3UWJRlaWNbN4A72spxk=;
     
b=5/a1Q97zI47lUjX6NSs3NQnqfDpr0sw3Fw8qz+S4wXvP4Lz4XPBP1ZxAl6gB2BHS/lwPoI0qoS+i
     
fzVAhbriOfdkQWyly9PvQiK24HxYJXriqcM8TzNb3Gi17eve6G7B64CWc2VBKKHgnD9wQ1nOjZcE
     /Bub/MFlpoUybU7TEJ0=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=rlvip.xyz; s=c;
     
h=mime-version:content-type:content-transfer-encoding:from:to:subject:message-id:date;
     
b=J9p7m6i6MBmdyLDanGfHokl+ONcxrD+BfrzuFAUBPVJBg2aCdvkcufFNZisTONC9pGveoiwFTykZ
     
C/reb+XZx8oGsQu/0OoX32Xhn5gqcr4C65vCTDMQVsp8cX5GbsyNRpTlq0+3IJxM5Fb2Be17s7jV
     hqblncCdNfcvBesmEWk=
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
 From: Kundenservice IK <Kundenservice-IK at rlvip.xyz>
To: andreas at rirasoft.de
Subject: Neuer Monatsbeitrag Andreas Reschke
Message-ID: <668c70579481f091073be490b79fb373 at rlvip.xyz>
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101
     Thunderbird/38.4.0
List-Unsubscribe: <http://www.rlvip.xyz/abm/N7HzQ40ZT2sc/>,
     <mailto:u-N7HzQ40ZT2sc-192 at rlvip.xyz>
Date: Fri, 5 Feb 2016 05:54:40 +0100