Error when sending E-Mail to my Company

Error when sending E-Mail to my Company

When I use the Zoho mail Server to send myself a Mail (to my company E-Mail address) I get the following Error:
This message was created automatically by mail delivery software. 
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

(Here was my company mail address), ERROR_CODE :550, ERROR_CODE :5.7.1 Error: content rejected 



Received:from mail.zoho.eu by mx.zoho.eu 
    with SMTP id 1505996168170390.4872410073341; Thu, 21 Sep 2017 14:16:08 +0200 (CEST) 
Message-ID:<15ea45ddbe6.103d73f6e49365.1578675654316650536@lightbringer.xyz> 
Date:Thu, 21 Sep 2017 14:16:08 +0200 
From:Lucifer Lightbringer <lucifer@lightbringer.xyz> 
User-Agent:Zoho Mail 
To:"janbucher" <(Here was  my company email address)> 
Subject:Test 
Content-Type:multipart/alternative; 
    boundary="----=_Part_132132_651271891.1505996168167"