I would like to request to have a domain name filter to allow SF admins to be able to filter out domains that are listed in the email body or from address.  I know this is already possible using the keywords.txt, but seriously, that would become a huge file potentially.  Another nice feature of this filter would be the abilty to auto prune old domain names out of the list, say like every week, month or so.  Spammers usually only send they're junk with a domain name link in the messages for maybe a few weeks before they toss away the name and go onto another name.

Any thoughts here on my idea?

Michael