I'm using samba 4.1.0pre1-GIT-bcacd8f provisioned to use the internal dns server. On Ubuntu 12.04 server 64 bit. I need to add MX record. network 192.168.1.0/24 domain controller: dc.fond.ru (192.168.1.100) zone name: fond.ru mail server: zimbra.fond.ru (192.168.1.104) I add A record: ./samba-tool dns add dc fond.ru zimbra A 192.168.1.104 Query: ./samba-tool dns query dc fond.ru zimbra A Name=, Records=1, Children=0 A: 192.168.1.104 (flags=f0, serial=2, ttl=900) and host -t A zimbra.fond.ru.returns: zimbra.fond.ru has address 192.168.1.104 Good! But: Add MX record: ./samba-tool dns add dc fond.ru zimbra MX 'zimbra.fond.ru 10' Query: ./samba-tool dns query dc fond.ru zimbra MX Name=, Records=2, Children=0 MX: zimbra.fond.ru. (10) (flags=f0, serial=3, ttl=900) but host -t MX fond.ru. returns: Host fond.ru. not found: 3(NXDOMAIN) I may be wrong to add the MX record?