Hi xnyx,
Regarding the first problem you stated, it is a known issue for a hardware node with 2 network cards when VPS binds a wrong interface on boot up from time to time. Virtuozzo developers are aware and hopefully it will be fixed in the nearest releases. As for now, I would recommend to decrease the number of reboots for your VPS server. Please also feel free to contact techs via
dedicated@lunarpages.com to manually restart your host as soon as possible if VPS does not come back after reboot.
As for the second issue, it does appear that your server processing a lot of incoming SMTP connections. It would be suggested to review the logs at /usr/local/psa/var/log/maillog for qmail to exactly get what is happening. If you notice that your domains are getting spammed, a RBL setup would be considered. Please see
http://forums.sw-soft.com/showthread.php?threadid=39634 on how to setup RBL in Plesk 8.1
Please do let us know if you have any additional questions.
I hope this helps.