LinuxQuestions.org - [SOLVED] postix abuse and security email accounts and nobody user

Hi,
There is a Debian Etch server + Postfix 2.5.5-1.1 .
Tried to create abuse@mydomain.com and security@mydomain.com accounts and it seems postfix has some kind of special treatment for those accounts.

Trying to send messages to those accounts it returns:

Code:

I'm sorry to have to inform you that your message could not

be delivered to one or more recipients. It's attached below.



For further assistance, please send mail to postmaster.



If you do so, please include this problem report. You can

delete your own text from the attached returned message.



                  The mail system



<root@mydomain.com> (expanded from <security@mydomain.com>): can't

  create user output file. Command output: procmail: Quota exceeded while

  writing "/var/mail/nobody"

mydomain.com is a fake domain for the real domain that I use.

I don't know why there's a nobody user that uses /var/mail/nobody, and its quota is exceeded indeed. This file is filled with messages errors etc.

How can I treat security and abuse as normal accounts?

regards