Change the DNS registration from crm to myserver.
If you have a pfSense box which runs the DNS forwarder and you want then (and only them) to see myserver as the backtranslation of the IP address then I suspect it might be sufficient to add a mappin in the DNS forwarder to say myserver has the specified IP address (or enable Register DHCP leases in DNS Forwarder on the Services -> DNS Forwarder page).