Filter Junk Activities (Email)

Hi,

I am fetching CRM Activities (Email,Phone call,conversation etc) into my application using CRM Sdk. I want to filter out emails based on some patterns (e.g. system generated emails,welcome mails or spam/junk mails).

Can we do this?

Is there is any field which tell us that perticular mail is spam or something ? or any SDK support for this ?

Thanks,

Swapnil