disable main email account

[cyberspirit]

Is there a way to disable or block the main email account in cpanel?
Most people create accounts and do not really care what their username or login is. So the main email account is mostly not used anyway but spamers still send stuff randomly there.
So I am looking for a way to block all mail to the main users email account or blackhole it because the account is not really used.
Any ideas?

[rking]

pico /etc/valiases/domainname.tld

(obviously domainname.tld should be the domain name you wish to disable the default account for)

It will probably look like this:

*: username

put this in place of it:

*: :fail: No Such User Here

You can also go into WHM->Tweak Settings and set Default Catch All/Default address behaviour to "fail" for new accounts. This effectively disables the default account. Not sure how to get it to stop showing in the client's cpanel, period.