Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

You can specify a particular file type (“exe” files for example) or common groups of attachments in the 

attachment-filetype

 and 

drop-attachments-by-filetype rules

. AsyncOS divides the attachments 

into the groups listed in 

If you create a message filter that uses the

 !=

 operator to match a message that does not contain an 

attachment with a specific file type, the filter will not perform any action on the message if there is at 
least one attachment with the file type you want to filter out. For example, the following filter drops any 
message with an attachment that is not an 

 file type:

If a message has multiple attachments, the Email Security appliance does not drop the message if at least 
one of the attachments is an 

.exe

 file, even if the other attachments not 

.exe

 files.

encrypt

Use Cisco Email Encryption to encrypt outgoing 
messages. See 

exe_check: if (attachment-filetype != "exe") {

                   drop();

               }