postfix ignores domain name

[berny]

I have a problem with ispconfig and postfix. Postfix accepts mail for any existing username at any existing domain.

Let's say domain1.com has a user called web1_user1. Postfix now not only accepts mail to web1_user1@domain1.com whicht it should but also to web1_user1@domain2.com, web1_user1@domain3.com and so on. The wrongly accepted mail is all store in the account of web1_user1.

Postfix will also accept mails for all system accounts like ftp@anydomain.com or proxy@anydomain.com.

What can I do so that postfix only accepts mail if the username is configured for that specific domain?

My /etc/postfix/main.cf

# 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

# TLS parameters
smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${queue_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 = sub.domain.net
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
relayhost = 
mynetworks = 127.0.0.0/8
#mailbox_command =   # macht wohl ispconfig
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
smtpd_sasl_local_domain = 
## BERNY: --> vielleicht liegt es an SASL
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
# Hier die ganze Spamabwehr:
smtpd_recipient_restrictions =
   permit_sasl_authenticated,
   reject_invalid_hostname,
# Mit Vorsicht zu geniessen:
   reject_unknown_hostname,
   reject_non_fqdn_hostname,
   reject_non_fqdn_sender,
   reject_non_fqdn_recipient,
   reject_unknown_sender_domain,
   reject_unknown_recipient_domain,
   permit_mynetworks,
   reject_unauth_destination,
   reject_rbl_client zen.spamhaus.org,
   reject_rbl_client list.dsbl.org,
   reject_rhsbl_client rhsbl.sorbs.net,
   reject_rhsbl_sender rhsbl.sorbs.net

body_checks = pcre:/etc/postfix/body_checks.pcre
header_checks = pcre:/etc/postfix/header_checks.pcre
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
#home_mailbox = Maildir/ # macht wohl ISPConfig anders

virtual_maps = hash:/etc/postfix/virtusertable

mydestination = /etc/postfix/local-host-names

[falko]

This is normal as you're using system user names before the @. Try to use aliases instead (they're defined in /etc/postfix/virtusertable).