==== Required information ====
- iRedMail version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
======== Required information ====
- iRedMail version: Iredadmin Pro v1.8.1 (MySQL)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: FREEBsd 9.2
====

To someone who want to setup proxy server using iredmail. Hope this will help you.

Here's my Setup.

Freebsd 9.2
Iredmail & Iredadmin Pro v1.8.1 (MySQL)
Fetchmail
Webmin (to configure fetchmail Config file and other setting for the newbie like me)

Follow the installation instructions of iRedmail & iRedAdmin from the website. Don't ignore the amavisd installation.

IredAdmin:
Turn off Greylisting since the internet mail server itself mark the spam. If enable email will be delayed or block.
Don’t use catchall to prevent doomsday (don’t know after enable catchall cannot receive any email. Now leave it as it.)

Ignore error:
Cannot rename fetchids file /root/.fetchids_ to /root/.fetchids: Permission denied (no idea but my mail proxy server working fine by ignoring this error.)

Fetchmail config;
defaults
        proto pop3
        port 995
        timeout 300

set no spambounce
set no bouncemail
set daemon 300
*this is my setting. You can do your own setting.

Goodluck,