Fremail Plugin Suggestion

[Marc Perkel]

I'd like to suggest an additional feature for the freemail plugin. If 
you test the sending host through FCrDNS and determine that the sending 
host is a freemail hostname (like google.com) then you should consider 
it a freemail sender. Thus if the sending host is Google, but the 
reply-to or an email address inside the message is yahoo, it's probably 
spam.