I have a windows AD server which has DNS with all my host names. If you don't have a local DNS server and use the Astaro to forward maybe try using the "Static DNS Entries" section... might work.

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Sophos UTM 9 (9.004-34) (64-bit)
Home Network
Running on an ESXi 5.0 Host
Virtual appliance details:
2 x 2.66GHz Virtual CPU | 3GB RAM | 30GB Disk | 4 x VMXNET3 Virtual Adapters