Hi
looks like i have a similar issue . Since today ...
After restart this disappeared. But why did it happen ? 
I didnt have the faulty line in my mails.
Yours
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Mail Queue Viewer
Milter Inbound:
total 1556
-rw-------. 1 postfix root  29443 Aug  3 08:59 4BKpf56Crbz54HRH
-rw-------. 1 postfix root   4877 Aug  3 09:34 4BKqR024m1z54Ht8
-rw-------. 1 postfix root 314180 Aug  3 09:48 4BKqkZ6TGyz54Ht8
-rw-------. 1 postfix root 276194 Aug  3 09:50 4BKqnJ1LjVz54Ht8
-rw-------. 1 postfix root   4875 Aug  3 09:56 4BKqvf3SZnz54HtD
-rw-------. 1 postfix root  52262 Aug  3 10:10 4BKrCh0mHXz54Ht8
-rw-------. 1 postfix root  82742 Aug  3 10:50 4BKs5y57HCz54Ht8
-rw-------. 1 postfix root 104705 Aug  3 10:54 4BKsBK55fzz54Ht8
-rw-------. 1 postfix root  50579 Aug  3 11:08 4BKsVn1tg6z54Ht8
-rw-------. 1 postfix root   6327 Aug  3 11:14 4BKsdy5dkHz54Ht8
-rw-------. 1 postfix root 117231 Aug  3 11:16 4BKshp1Htgz54Ht8
-rw-------. 1 postfix root  87513 Aug  3 12:02 4BKtjJ0dxwz54Ht8
-rw-------. 1 postfix root  56231 Aug  3 13:03 4BKw473hB8z54Ht8
-rw-------. 1 postfix root  78231 Aug  3 13:15 4BKwL146wDz54Ht8
-rw-------. 1 postfix root  27977 Aug  3 13:59 4BKxJT0hXNz54Ht8
-rw-------. 1 postfix root  14951 Aug  3 14:49 4BKyQH57P3z54Ht8
-rw-------. 1 postfix root  34863 Aug  3 15:14 4BKyz94JT9z54Ht8
-rw-------. 1 postfix root  12092 Aug  3 15:45 4BKzg64KdXz54Ht8
-rw-------. 1 postfix root  46751 Aug  3 16:27 4BL0Zs0Vvxz54Ht8
-rw-------. 1 postfix root   4320 Aug  3 17:49 4BL2PJ35yYz54Ht8
-rw-------. 1 postfix root  12822 Aug  3 20:31 4BL60Y6wthz54Ht8
-rw-------. 1 postfix root  69049 Aug  3 21:17 4BL71D1Yqtz54Ht8
-rw-------. 1 postfix root  49776 Aug  3 21:33 4BL7N06zJxz54HtD
-rw-------. 1 postfix root   3215 Aug  3 22:02 4BL81h0DC1z54Ht8
---
sample 
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[root@efa4 milterin]# more 4BL81h0DC1z54Ht8
O<
bbb@sss.de>
S<
sss@gmx.de>
Received: from mout.gmx.net (mout.gmx.net [212.227.17.22])
        (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
        (no client certificate requested)
        by efa4.sss.de (MailScanner Milter) with SMTP id 4BL81h0DC1z54Ht8
        for <
bbb@sss.de>; Mon,  3 Aug 2020 22:02:32 +0200 (CEST)
X-Greylist: from auto-whitelisted by SQLgrey-1.8.0
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net;
	s=badeba3b8450; t=1596484950;
	bh=M8xsy95DsaIakwQ/CUjErUJBHlSjk+1LrEYBWBkuNoY=;
	h=X-UI-Sender-Class:To:From:Subject:Date;
	b=YfGM8NiPj3Ejora1sHIi5xlYThVYx5/OP/7jZZaDl4gzo21MpDgejilQIr5aT7wgl
	 k3AjZWyELbExqk9QCpNlfHSRFTGy9nOEkJIm5cUO+t4XTvEiZ6IWijQzIp9zDXA55b
	 ++8gZxalIrWRV3PD+VcePg4w++tqUpTllDJIMJkE=
X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c
Received: from Blob.local ([88.134.72.18]) by mail.gmx.com (mrgmx105
 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MvsEx-1kvTTV0mGd-00st9j for
 <
bbb@sss.de>; Mon, 03 Aug 2020 22:02:30 +0200
To: =?UTF-8?Q?Bob Marley?= <
bbb@sss.de>
From: Ich <
sss@gmx.de>
Subject: test nach zertifikat
Message-ID: <
df200109-2ba2-1191-7069-902a7bdf96e1@gmx.de>
Date: Mon, 3 Aug 2020 22:02:27 +0200
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0)
 Gecko/20100101 Thunderbird/68.11.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Content-Language: de-DE
X-Provags-ID: V03:K1:dE6go6Bz4jz5/JIYzW7V4mu49h+24es6CtcW4LCgR2iRs/B89nF
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 Y8Nkd9ZiJj98J6wR4PFSw==
X-Spam-Flag: NO
X-UI-Out-Filterresults: notjunk:1;V03:K0:hmgAMNwSB30=:TXYkSPuWJ5TPXEM70pD6yC
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sss