Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

For more information, see 

.

The following examples shows actions performed on attachments:

In these examples, AsyncOS inserts headers when the attachments contain specified content. 

In the following example, all of the attachments on the message are scanned for a keyword. If the 
keyword is present in all of the attachments, a custom X-Header is inserted:

In the following example, the attachment is scanned for a pattern in the binary data. The filter uses the 

attachment-binary-contains

 filter rule to search for a pattern that indicates that the PDF document is 

encrypted. If the pattern is present in the binary data, a custom header is inserted:

In the following example, the “executable” group of attachments (

.exe

, 

.dll

, and 

.scr

) is stripped from 

messages and text is added to the message, listing the filenames of the dropped files (using the 

$dropped_filename 

action variable). Note that the 

drop-attachments-by-filetype

 action examines 

attach_disclaim:

    if (every-attachment-contains('[dD]isclaimer') ) {

        insert-header("X-Example-Approval", "AttachOK");

    }

match_PDF_Encrypt:

if (attachment-filetype == 'pdf' AND

attachment-binary-contains('/Encrypt')){

strip-header (‘Subject’);

insert-header (‘Subject’, ‘[Encrypted] $Subject’);

}