Our users are having issues with sending emails with zip file attachments. I have looked at our exchange server setting and I can seem to find anything that pops out. I also verified our email security gateway and did not find anything. I have not changed anything in our server or Barracuda email security gateway. Below is the error I get. Any help would be greatly appreciated.
Delivery has failed to these recipients or groups:
The email system had a problem processing this message. It won't try to deliver this message again.
Diagnostic information for administrators:
Generating server: xxx.amormeus.org
Remote Server returned '554 5.6.0 Invalid content'
Original message headers:
Received: from xxx.amormeus.org ([::1]) by xxx.amormeus.org
([::1]) with mapi id 15.00.1473.005; Mon, 21 Oct 2019 07:48:36 -0500
Date: Mon, 21 Oct 2019 07:48:36 -0500
Subject: this is a test