Settings:
Debian 5.0 Lenny
iRedMail-0.5.1.tar.bz2 2009-11-01.
Do you have amavisd schema file included in openldap config file?
I do not know, just run the installation and conflagration bash, and I have a problem after installing the iRedmail reboot my server and it stops internet access to be this, just after installing iRedmail
apt-get update
Err http://security.debian.org lenny/updates Release.gpg
Could not resolve 'security.debian.org'
W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems
after that I can not connect remotely to the server