I have a problem with qmail for Centos 6. Other aspects of Kloxo-MR already running well on Centos 6.
For qmail, send mail is OK but receive mail stuck on 'mail queue' (not able to move to inbox).
So, this issue still investigate.
BTW, since Kloxo Official 6.1.7, not relevance to ask running well on 64bit or not.
An issue just running on Centos 6 or not.