Recommended issue tracking system?

Hi,

We've been using RT2 and RT3 (request-tracker) for some years for  
trouble ticket (bug) tracking and customer support issue management,  
but we've been less than impressed with its scalability and user- 
friendliness.

I know of Mantis, that Candis is using, right?  And Bugzilla is  
famous, but very software development centric.  There are add-ons to  
most CMS-like systems, but I am suspecting they may not be as far  
developed.

We're looking for something that is very user-friendly and very  
suitable to big customer service organizations; getting hundreds of  
emails every day.  Does anyone have experience they can share?  It  
should run on Linux (unless there are very good arguments against it)  
and be open source (unless there are good arguments against it).

Rgds,
-- Bjorn
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