mail.mycorp.local
smtp.mycorp.local
auth.mycorp.local

[dc]
dc01.mycorp.local
dc02.mycorp.local

[ldnappsrv]
app01.ldn.mycorp.local
app02.lnd.mycorp.local

[txappsrv]
app03.tx.mycorp.local
app04.tx.mycorp.local

[itlappsrv:children]
ldnappsrv
txappsrv