Hello, I ask this question to be sure I well understood. I built 2 servers. One ispcconfig perfect server and it's mirror following pdf documentation : mariadb sync, dovecot sync and unison Now, I create on main server a domain and related mail address via ispc I built 2 MX on DNS, one pointing on server1, one on server 2. I think it's ok, but, I am confused because in ispconfig web interface my mail domain is "attached" to server1 only !