The problem with using only default email as a catchall email account can be summarized in four letters - S P A M. It's a good idea to re-route emails to a default/catchall account. This tutorial shows you how to create a default email address and re-route emails using cPanel.
This email account will be the target for spammers. Spammers normally just guess your email address and hope that you have a catchall email address so that you'll receive their email even if it the email address they use doesn't exist.
So, my advice is for you to set up separate email accounts and have all the email going to your default account be deleted automatically.
You can have them automatically deleted by routing all messages for your default account to :blackhole:
Okay, this is hard to explain without a screencast video, so watch the following to see how you can re-route your emails to the "blackhole".
This increases the chance of you getting legitimate emails.
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