Hello, i can help you, I work for 14 years with windows, Linux and email servers mainly internal servers (inside the company for copy of emails with internal and external auditing and control) in postfix and dovecot, WHM and cpanel.
Today I have 6 servers with WHM, each of them with 50-60 domains, I install MailScanner to use RBL, mark as spam and deliver the email.
I am certified in Windows 2008 Active directory Specialist.
I also develop scripts in php and I know the php + mysql environment well