Denying attachments

Bahadir Kiziltan b_kiziltan at HOTMAIL.COM
Tue Dec 13 17:03:50 GMT 2005


Hi,

Using MailScanner version 4.47.4 with postfix, bitdefender, clamav and spam 
enabled on Fedora Core 4 box. Also monitoring and reporting via MailWatch. 
The results are incredible, at least for us.

I have a minor issue in denying files attached to mail messages. All the 
files mentioned have zip extension sized below 1KB but actually they're text 
files with the following more or less the similar content.

------
Your attachment "mailtext.zip" contained viruses:
         "W32.Sober.X at mm!zip",
         and "W32.Sober.X at mm" at location "File-packed_dataInfo.exe
It was deleted and replaced with this text file.
------

------
Your attachment "downloadm.zip" contained viruses:
         "W32.Sober.X at mm!zip",
         and "W32.Sober.X at mm" at location "File-packed_dataInfo.exe
It was deleted and replaced with this text file.
------

According to the maillog, such attachment comes to the MTA as is. Sure, not 
modified by MailScanner.

Set the directive "Minimum Attachment Size" to 1024, they are all denied 
successfully but also with the "delivered and read" confirmation messages.

What do you recommend in order to deny such file(s) more effectively?

Thanks.
Bahadir.

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