Hi,
I am having more than six years of experience in Linux Administration and hosting services, I had worked with all king of hosting panel, including WHM/cPanel and also managing thousands of mail users based on various mail apps like Sendmail, Exim, Zimbra etc.
You can refer my profile to get more about my knowledge/experience required to complete this project. IF you need any additional information please feel free to contact me.
THanks
Sachi