Hi,

yes, there are two controls for Clamav. One is the email scanner which you show in your screenshot. The other is the file server scanner, which I showed.

If you see that you're getting hundreds of emails and that is causing CPU issues then I suggest you look into using some of the antispam configuration settings such as "rbl_blacklist" in postfix. @Nick has a great FAQ to help you through fighting spam on this site. There are also a number of discussions in the forum that give further details. You might also try the greylisting (sp?) for the mail server. I found it to be a bit inconvenient at times but it really reduced the amount of spam coming in.