using thunderbird - or other client - junk control data

[Tim <ti...@litwiller.net>]

In the recent discussion  someone suggested using the junk data that 
Thunderbird or other email client that have a learning mechanism to make 
rules for spamassassin.  Has anyone done or looked into what it would 
take to do this. I imagine it would be quite expensive processor wise.  
But Thunderbird pretty much catches everything that spamassasin misses 
in my case.