Choosing a control panel

[foxb]

It is a bit strange the problem you have with the e-mail?!
qmail is not the best MTA now. I don not remember where i read that, but someone mentioned that the development is sort of stopped, but still rejecting every message it looks like misconfiguration somewhere.
You mentioned 64-bit - on kloxo web page only 32-bit is noted as stable?!
FYI 32-bit + PAE kernel uses more than 4G RAM.

I had to mention that I've used only sendmail or postfix and I find both very stable.
For example I have a sendmail based spam filter and at some points I was receiving over 50K e-mails/day (96% spam of course).

IspCP work as well with CenOS as With Debian - No need to change the OS

Personally I also do not like cPanel. That one of the reasons I use IspCP now. I missed Kloxo when I did my research on CPs, but it looks nice, maybe it would be a weekend test project this summer.

I'm not aware of any support for shell for users, but someone else can have more information...