This is just an ideea
1. create account test.com
2. edit DNS zone so that the MX record point to the server where you wish to receive emails
3. edit DNS zone so that the A record point to the server where you wish all your other trafic go
4. save DNS zone and restart NAMED
Please let me know if i can assist you further,
Designeru.
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For more support contact me: designeru {at} gmail {dot} com