Originally Posted by agoston
If I setup for a domain, that the mail server is the slave, ISPConfig puts the data to the slave's db? I can't test it now, because I just upgraded to 22.214.171.124 and I am using Gentoo, so I need to rewrite some parts of the installer
That's what the replication system of ispconfig does. You can choose on which server a domain shall be created and ispconfig does the rest.