Linux Server Setup & Zimbra Setup Configuration

Hello This task is not for any freshers who want to dig their fingers for their R&D Works This is for a Corporate Mailing Solution: Point #1) We are having 2 or 3 Linux Ubuntu OS servers. All of them (If 2/3) need to be Synchronized in such a way that If Server 1 is down then Server 2 & 3 should work as a backup, if server 2 is down then 1 & 3 Should be working to support the system. That we generally call it Server Mirroring / Server Synchronization. Point #2) We are planning to setup Zimbra Mailing Setup. and 5 Domains would be having Mailing Solution for the same. Point #3) Further details will be disclosed in person: for the above two i need the rate quotes from experts Point #4) We don't guarantee now at this point of time, but based on the selected contractor's performance, we may select him/her on a long term contract. Happy bidding and don't forget to enclose your Resume & work experience so that we are assured of you. (Please Note that we won't be entertaining any candidate who is not giving their work experience credentials.