Mail recovered after network address clash

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I created a VM today that reused the IP address that was once used for io.ilrt.bris.ac.uk. This assigned a non-unique mac address to the VM which was the same one in use on mail.ilrt.bris.ac.uk. This caused some flapping of the routing to the node. To ensure that this does not happen again I’ll look into checking for mac addresses in use on the network and/or use a different range which will not produce clashes.