ZCS 6.0.4

I have a Zimbra user trying to send a Power Point attachment (*.ppt extension) to internal users. Zimbra is blocking it with the message below. It is not a virus. Any suggestion on how to stop this from being blocked?

Also, I sent the attachment from my Zimbra account to hotmail and yahoo and it never not showed up in either account; nor did it bounce.


----- Forwarded Message -----
From: "Content-filter at webmail.brs.com" <admin@webmail.brs.com>
Sent: Wednesday, March 24, 2010 11:31:16 AM
Subject: VIRUS (Encrypted.Zip) in mail TO YOU from <esmall@brs.com>


Our content checker found
virus: Encrypted.Zip

in an email to you from probably faked sender:
claiming to be: <esmall@brs.com>

Content type: Virus
Our internal reference code for your message is 15045-14/KNl7x0CtNNff

First upstream SMTP client IP address: [10.9.10.xxx] unknown
According to a 'Received:' trace, the message apparently originated at:
[10.9.10.xxx], webmail.brs.com unknown [10.9.10.xxx]

Return-Path: <esmall@brs.com>
From: Ed Small <esmall@brs.com>
<262989114.1012292.1269444674685.JavaMail.root@brs .bigrocksports.com>
X-Mailer: Zimbra 6.0.4_GA_2038.RHEL5_64 (ZimbraWebClient - SAF3
Subject: Fwd: Board Discussion
The message has been quarantined as: virus-KNl7x0CtNNff

Please contact your system administrator for details.