3. Specify  whether to apply  this rule to inbound  mails, internal mails, 

outbound  mails  or  all.  To  understand  how  GFI  MailSecurity 

determines  whether  a  mail  is  inbound,  internal  or  outbound,  see  the 

chapter  Advanced Use . 

Checking attachments 

4.  Specify  which  attachments  to  block.  You  can  specify  a  list  of 

attachments  types  or  names  to  block,  or  you  can  specify  a  list  of 

attachments which are allowed through, such as doc or txt. 

Adding a file type or file name to block 

To add a file to block, click on the `Add' button. You can use asterisk 

(*)  wildcards  to  specify  file  names  that  have  certain  strings  in  the 

name. For example specifying *orders*.mdb blocks files which contain 

the string  orders  in the file name. *.jpg will block all jpg files. 

You  can  also  block  attachments  based  on  size.  To  do  this  simply 

select `Block files greater than' and enter attachment size. 

The attachment checking rule `Actions' tab. 

Configuring Content & Attachment checking 

 33