Carlos,
We don\'t touch email processes at all.
If you want to limit IMAP processes, you will need to install experimental processes:
http://www.cloudlinux.com/blog/clnews/386.php
And run:
echo -n +/path/to/the/imap_process > /proc/lve/enter
To disable it:
echo -n -/path/to/the/imap_process > /proc/lve/enter
This is available only in the latest kernel, and this has to be executed on system start up.