What is a “catchall” account and how do I use one?
Your master email account operates as a “catchall” account that is capable of receiving all mail sent to your domain. As a result, you do not need to set up individual accounts, unless you have accounts that must go to separate people. For example, you might want your sales and billing information to go to the people who manage those departments. In this case you could set up separate POP3 accounts that would then be accessed individually by the specific individuals.