[courier-users] 550 error :-(

[Vytautas K. <Vy...@5c...>]

Hello,
Installing Courier 0.35 on RH6.2 machine(with latest kernel and updates)
Courier was installed from RPM's I made on this machine.

Created 3 users:
userdb file:

Tania   uid=501|gid=100|home=/home/Tania|shell=/bin/bash|systempw=<skipped>
501=    Tania
vytas   uid=500|gid=500|home=/home/vytas|shell=/bin/bash|systempw=<skipped>
500=    vytas
Monika  uid=511|gid=500|home=/home/Monika|shell=/bin/bash|systempw=<skipped>
511=    Monika

locals file:

a1.xx

me file:

server.a1.xx

hosteddomains directory is empty.
Now problem:
I can access all mailboxes via imap or pop3 without problems. I can send
mail ONLY to user vytas@a1.xx
When I trying to send messages to users Monika@a1.xx or Tania@a1.xx I'm
getting following error:

Jul 31 17:24:24 TInet courieresmtpd: started,ip=[::ffff:212.XXX.XX.XX]
Jul 31 17:24:25 TInet courieresmtpd:
error,relay=::ffff:212.XXX.XX.XX,from=<Vy...@5c...>,to=<Monika@a1.xx>: 550
User unknown.

I think, I tried all possible combinations, I found in Courier mailing lists
or via search engines..... :-((((
I hope i made very simple mistake......