separate instances of Thunderbird or Kmail

[O. Sinclair]

I have a feeling this might have been discussed before but here goes:
I run both Kontact/Kmail and Thunderbird as mail clients, the reason 
being that I use Kontact for all my business and also personal emailing.

Thunderbird I use for mailing-lists such as this. For me this works 
better than "disturbing" my business with loads of mail that might or 
might not be interesting to what I am doing at the moment. It is also a 
support-issue, I have users that use one or the other.

So far so good. Now I have joined a mailinglist that has got to do with 
trading mainly (bartering you might say) and I get flooded with mails 
where maybe 1 of 10 is interesting. I dont want to go webmail for it 
since I want to save the  interesting ones and not always have to be 
online when I go through downloaded mails.

So I am looking for a way to run a second instance of Thunderbird or 
Kmail that is totally separate and "unaware" of the "main" ones. I did 
install Clawmail and I dont like it one bit but am using it 
nevertheless. I tried Mailody but it does not seem to store retrieved 
mails offline so is useless to me.

Anyone has ideas of how to achieve this. And please do not suggest Mutt 
or other cli - clients, I am far too gui-oriented.

Regards,
Sinclair