Free with hosting packages.

Your default email account is your "catch all" email account.

Any mail addressed to your domain that does not have an individual account set up for it will automatically go to this address.

How it works:

You can change the username portion of your default address.

Just click on the "default address" link in your control panel and type in the new address. 

Type the entire address: yourname@yourdomain.com.

Then click "change".

Make sure you are using an account that actually exists. If the account doesn't exist, set it up using the new email accounts feature.
 

You never have to create email aliases.

Your default email account is setup as a "catch all" account, meaning that any email coming to anything@yourdomain.com is delivered to your default account.

This tool is also useful if you wish to have all incoming email (or all undeliverable mail) sent to another email address such as a Yahoo or Hotmail address.