[Spambayes] More spam than ham

[Gary Smith]

A twist for me,

Spambayes has been so good at finding HAM that it no 
longer identifies HAM as unsure or SPAM. I'm still 
getting spam that sometimes shows as HAM so I train 
it as such.

Now I get this notice:

"Warning: you have much more spam than ham - 
SpamBayes works best with approximately even 
numbers of ham and spam."

How do I deal with this? should I find old emails known 
to be good and paste the raw header/message info 
into the "Train on a message" window?

Since so much is accurately coming in as HAM but 
SPAM is eternaly new, how do I best bolster the 
trained HAM emails ratio?

Thanks,

Gary