Use your domain manager's mail manager system to create these as aliases, DO NOT attempt to set up these standard main addresses as POP accounts. You can even use this file to forward mail being sent to your administrative account back to your existing email address at your local service provider. To edit it, simply use your domain manager's mail manager. You may create as many aliases at your domain in this file as long as it conforms to the basic structure and the target address are real POP boxes somewhere. The system automatically creates a .redirect file in your home directory which activates your mail forwarding and aliasing features.
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Once you get it to your HOME directory rename it if needed. This will just cause mail loops and other problems. You should not use both the .redirect and the .forward file at the same time unless you are using another mail manipulation program such as MReply. Using both files at the same time will result in the .forward being honored first. All other rules and notes on creating the .redirect file also apply to the .forward file.