Knowledge of Zimbra, QMail, Postfix Messaging and Linux Operating system in a must.Implementing, maintaining, monitoring & Supporting Zimbra Setup.Linux (Redhat, Centos) administration°Knowledge of core internet protocols e.g. SMTP, DNS, FTP, HTTP, HTTPS 2. Knowledge of Apache, Zimbra, Qmail, MySQL, Postfix 3. Should be ready to work in 24x7 environment. (in shift).°