exploit@nsl:~$ host -t cname mail.idolci.net 127.0.0.1
Using domain server:
Name: 127.0.0.1
Address: 127.0.0.1#53
Aliases: 

mail.idolci.net is an alias for saturne.veepee.net.
exploit@nsl:~$ host mail.idolci.net 127.0.0.1
Using domain server:
Name: 127.0.0.1
Address: 127.0.0.1#53
Aliases: 

Host mail.idolci.net not found: 3(NXDOMAIN)