Default email account created with accounts (why is neccessary to create one?)

[albatroz]

I guess that although it is a legacy practice, it is a bad idea, as it can
be easily filled with spam.
Plesk, for instance does not have this "feature" ...

[cPanelDavidG]

I guess that although it is a legacy practice, it is a bad idea, as it can
be easily filled with spam.
Plesk, for instance does not have this "feature" ...

Indeed, hence we permit you to change this setting. In WHM -> Server Configuration -> Tweak Settings in the Mail section set Default catch-all/default address behavior for new accounts. fail is usually the best choice if you are getting mail attacks. from localuser to fail.

Check out http://bugzilla.cpanel.net/show_bug.cgi?id=5164 for further recommendations others have made regarding this functionality.