dovecot - Sep 2007 - Dovecot ignoring reject_code & delay_warning_time settings

Hello,

hope guys someone can help me

i have installed mailserver according this tutorial
http://johnny.chadda.se/2007/04/15/mail-server-howto-postfix-and-dovecot-with-mysql-and-tlsssl-postgrey-and-dspam/
which is linked from dovecot maunal pages

Using Debian Etch 4.1 amd64,  Postfix 2.3.8, Dovecot v1.0.rc15 ,  have 
tried also 32bit version with same result

Everything works great except when i send mail to non-existing user in 
existing domain
Dovecot is ignoring Postfix main.cf values
delay_warning_time = 4h
and
unknown_local_recipient_reject_code = 550

And  is sending  error message ca every two hours for 4 days like :

 Out: 220 mailserver2.mydomain.tld ESMTP Postfix (Debian/GNU)
 In:  EHLO mail.otherdomain.tld
 Out: 250- mailserver2.mydomain.tld
 Out: 250-PIPELINING
 Out: 250-SIZE 10240000
 Out: 250-VRFY
 Out: 250-ETRN
 Out: 250-STARTTLS
 Out: 250-AUTH PLAIN
 Out: 250-AUTH=PLAIN
 Out: 250-ENHANCEDSTATUSCODES
 Out: 250-8BITMIME
 Out: 250 DSN
 In:  STARTTLS
 Out: 220 2.0.0 Ready to start TLS
 In:  EHLO mail.otherdomain.tld
 Out: 250- mailserver2.mydomain.tld
 Out: 250-PIPELINING
 Out: 250-SIZE 10240000
 Out: 250-VRFY
 Out: 250-ETRN
 Out: 250-AUTH PLAIN
 Out: 250-AUTH=PLAIN
 Out: 250-ENHANCEDSTATUSCODES
 Out: 250-8BITMIME
 Out: 250 DSN
 In:  MAIL From:<rh at tvujweb.cz> SIZE=704
 Out: 250 2.1.0 Ok
 In:  RCPT To:<non_existing_user at existingdomain.net>
 Out: 451 4.3.0 <non_existing_user at existingdomain.net>: Temporary
lookup failure
 In:  QUIT
 Out: 221 2.0.0 Bye

I have googled out somewhere parameter for dovecot.conf
unknown_address_reject_code = 550 , but Dovecot is not taking this one.

Is Dovecot using Postfix paramteres
delay_warning_time and
unknown_local_recipient_reject_code ??

Assuming not, becauase Postfix is delivering over Dovecot, as defined in 
postfix/master.conf
dovecot unix - n n - - pipe flags=DRhu user=vmail:mail 
argv=/usr/lib/dovecot/deliver -d $(recipient)


So how can i set this two parameters ??

Thanks in advance for any hint

Radim

-- 
Radim Hejc