Junk mixed in with ham on whitelists

[David Jones]

Over the years I have noticed junk/spam email coming from these servers 
so I created this rule:

header          ENA_RCVD_NOTRUST        Received =~ 
/\.(secureserver\.net|web-hosting\.com|websitewelcome\.com|inmotionhosting\.com|unifiedlayer\.com|ezhostingserver\.com|siteprotect\.com|internetbilisim\.net|privateemail\.com|registrar-servers\.com|emailsrvr\.com|registeredsite\.com) 
\[/

Many of these servers are listed on whitelists.  My solution is to meta 
those whitelists to add back the points they subtract and then 
selectively whitelist_auth safe/good sending domains coming from these 
servers.

I would be interested to hear how others handle this situation where 
good and bad email egress from the same set of servers.

I am not sure how these servers get listed on whitelists but all I can 
do is report some of them to SpamCop and try to get them off. 
HOSTKARMA_WL is usually very accurate but they list some of the servers 
above.

--
David Jones