Message Rules for headers (not email body) ...

I've been studying the raw messages and headers for my junk mail and come to the conclusion that hugh percent of my legitimate email has "for xxxxxx@yyyyyy.zzz" in the first "recieved:" header although some times that first header is split into multiple lines.The few ligitimate emails that didn't have my "for xxxxxxx@yyyyyyy.zzz" in the header were from my ISP and Microsoft's email welcome message ... in other words ... very ligitimate large vendors can get away with improper headers, but there seems to be very few of them and they can be easily white listed. Any email blasts from ligitmate sources still had the "for xxxxxxxxxx@yyyyyyy.zzzz" because they have to play by the rules.In various tests I've done ... it is clear that none of the standard rules allow you to search the recieve header and it also probably doesn't support a searching a string with a split in the header line. So even if a header could be searched ... a string of "for xxxxxx@yyyyyyy.zzz" would fail if the line split after the "for".So bottom line, ... Microsoft ... I'd assume youy have notice this failing so why don't you alllow rules for headers? If you do please tell me how and if it properly search a split line. Or is ut that you do not think we are not smart enough to use them or is it that you really want junk mail to chase us?