From iRedMail

0.6.0-rc1

Major changes since 0.6.0-beta3:

• Add catch-all account support in LDAP backend.
• Fix amavisd startup issue on FreeBSD: run sa-update first.
• Patch to fix roundcube security issue: CVE-2010-0464, Disable DNS prefetching.
• New LDAP attribute: userManager. Used to replace 'manager' attribute, use email address instead of dn.
• Update iRedAPD to 1.2.3. 0.6.0-stable will ship iRedAPD-1.2.4 which supports mysql alias restriction.

0.6.0-beta3

Major changes since 0.6.0-beta1:

• Better support for FreeBSD 7.2 & 8.0 -release with the newest ports tree, supports both i386 & x86_64/amd64. Here is installation guide.
• Use yum to install packages on RHEL/CentOS, not necessary to download all binary packages now.
• Software update:
  • phpLDAPadmin -> 1.2.0.5
  • iRedAPD -> 1.2.1 (Postfix policy daemon, used to restrict mail list access.)
  • iRedAdmin (Open Source Edition) -> 0.1.2 (No new features, but new translations)