[Mailman-Users] Problem with Mailman+Postfix

[gigahertz at fettabernett.de]

Hi there.
I´m using Postfix + Dovevot + Mailman on Debian Lenny with ISPConfig3 Setup.
I´ve installed Mailman seperate from ISPConfig via apt-get, 
administrating lists works fine but there is one problem: Postfix does 
not accept incoming mails to the mailing list.

mail.info:
Jul 22 10:53:13 atom-29 postfix/smtpd[12620]: NOQUEUE: reject: RCPT from 
mailout-de.gmx.net[213.165.64.22]: 550 5.1.1 <test at xyz.net>: Recipient 
address rejected: User unknown in virtual mailbox table; 
from=<abc at gmx.de> to=<test at xyz.net> proto=SMTP helo=<mailout-de.gmx.net>

main.cf of Postfix:
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = /usr/share/doc/postfix

# TLS parameters
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = atom-29.ip-projects.de
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
myorigin = /etc/mailname
mydestination = atom-29.ip-projects.de, localhost, localhost.localdomain
relayhost =
mynetworks = 127.0.0.0/8 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
html_directory = /usr/share/doc/postfix/html
virtual_alias_domains =
virtual_alias_maps = 
proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, 
mysql:/etc/postfix/mysql-virtual_email2email.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /var/vmail
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_recipient_restrictions = permit_mynetworks, 
permit_sasl_authenticated, check_recipient_access 
mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination
smtpd_tls_security_level = may
transport_maps = proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = 
mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
proxy_read_maps = $local_recipient_maps $mydestination 
$virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps 
$virtual_mailbox_domains $relay_recipient_maps $relay_domains 
$canonical_maps $sender_canonical_maps $recipient_canonical_maps 
$relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps
smtpd_sender_restrictions = check_sender_access 
mysql:/etc/postfix/mysql-virtual_sender.cf
smtpd_client_restrictions = check_client_access 
mysql:/etc/postfix/mysql-virtual_client.cf
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
virtual_transport = dovecot
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = regexp:/etc/postfix/mime_header_checks
nested_header_checks = regexp:/etc/postfix/nested_header_checks
body_checks = regexp:/etc/postfix/body_checks
dovecot_destination_recipient_limit = 1
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
content_filter = amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings
message_size_limit = 0
#Mailman
owner_request_special = no

What am I doing wrong?