Now my question is: How can I created a user account (or email account) of Postfix?
Usually using useradd or if you are using virtual mailbox, then there is another way that depends on configuration.
Thank you very much in advance. ps. I am sorry about the incidence where I was involved.
This is a bit offtopic (sorry about that), but maybe you need to switch cyrus to dovecot, it can make you life much easier. If you really want to keep cyrus, you need really do the rtfm in the long way.
thanks, -- Eero