Spam filtering is already done site wide and spam emails are flagged in the headers. To use the flags,
 create a file called .procmailrc on your home directory on chase with the following contents -

:0:
* ^X-Spam-Status: Yes
$HOME/mail/spam

:0:
* ^X-Is-Spam: Yes
$HOME/mail/spam

:0:
* ^X-NAI-Spam-Level: \*\*\*\*\*
$HOME/mail/spam

		 
This will move spam email to the folder spam. X-Spam-Status is our flag and X-NAI-Spam-Level is the UCIS flag.