How to add new email user without iredpanel?

==== Required information ====
- iRedMail version: -> how do i check that? I downloaded and installed it 7 days ago
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  Mysql
- Linux/BSD distribution name and version: Debian Squeeze
- Related log if you're reporting an issue:
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How can i create a new email user without using iredmail panel? It is enough to add the user in the DB? What are the correct steps do to this? And to add a new domain?

Thank you