[expert] kmail - 2problems

[brian]

Anyone else have problems with kmail being pretty bad at threading messages? 
Some things get put under other messages for no aparent reason. Others that 
should be part of a thread 8 messages deep show up at the top of my inbox on 
their own. 

I also get a lot of email from people showing the date as Wed Dec 31 17:59:59 
1969. I thought this might be my mail server which I am replacing, but am 
beginning to suspect Kmail. Anyone else get this problem?

TIA,
Brian