Hi, all.
I'd like to introduce iRedMail open source mail server solution for
RHEL/CentOS to you.
* iRedMail is:
    - mail server solution for Red Hat(R) Enterprise Linux and CentOS
      5.x, support both i386 and x86_64.
    - a shell script set, used to install and configure all mail server
      related software automatically.
    - open source project (GPL v2).
* iRedOS is:
    - Customized CentOS 5.x, remove unnecessary packages
    - Ships iRedMail.
* Download:
    - http://code.google.com/p/iredmail/downloads/list
    - http://www.iredmail.org/iredos/
* Feature list:
    http://code.google.com/p/iredmail/wiki/Features
* Installation guide:
    http://code.google.com/p/iredmail/wiki/Installation
* Success Stories:
    http://code.google.com/p/iredmail/wiki/Success_Stories
* Group/Forum:
    http://groups.google.com/group/iredmail/
-- 
Best regards.
Zhang Huangbin
- Open Source Mail Server Solution for RHEL/CentOS 5.x:
  http://code.google.com/p/iredmail/