mails aren't sent with thunderbird; User unknown in local recipient ta

============ Required information ====
- iRedMail version:  0.8.5
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Linux/BSD distribution name and version: Debian 7.2
- Related log if you're reporting an issue:
====
Hello. I can't make iRedMail works in several linux distros with several backends for a whole two weeks.
The problem is I can't send any mail with email programm (thunderbird). Anytime I have the same error:

550 5.1.0 <slon@m33.ga>: Sender address rejected: User unknown in local recipient table

I just need local mail server. It won't work in internet.

I receive mail in thunderbird; receive, send mail, create users with web interface; add accounts in thunderbird successfully. But can't send via thunderbird.
I have tried to edit postfix conf for a lot, but now it's default.
Don't know what to do. Please, show the light!