hi.

our smtp server is linux based, GNU/debian.

amavis keep on blocking the 2007 format. it bounce back and got an error like this on the amavis:

Original-Recipient: rfc822;xxx@xxx.com
Final-Recipient: rfc822;xxx@xxx.com
Action: failed
Status: 5.7.0
Diagnostic-Code: smtp; 554-5.7.0 Reject, id=01104-12 - BANNED:
554 5.7.0 .dat,ppt/media/image8.emf
Last-Attempt-Date: Fri, 25 Jun 2010 14:22:34 +0800 (PHT)
Final-Log-ID: 01104-12/jSGjY2K24rgy



Subject: test mail .pptx
Date: Fri, 25 Jun 2010 14:22:31 +0800
Message-ID: <053801cb142e$cbc3a980$634afc80$@com>
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0539_01CB1471.D9E6E980"
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AcsULsDsUGPVcvAOQ2O3kuRQUUIL8w==
Content-Language: en-ph

could you help me solve my problem? im not familiar with linux.

Does it happen to ALL Office 2007 documents, or just some?

If it happens to all, I'd suspect something Micro$oft has done to make it more difficult to use Linux in association with those files. Otherwise, I'd suspect they are all infected, or have some code (such as a macro) which triggers Amavis to reject the file.

Read the Amavis documentation (probably somewhere in /usr/share). Specifically, look for references to Whitelisting. I know you can whitelist Senders, but I don't know if you can also whitelist filetypes. Whitelisting might solve your problem.