[Postfixbuch-users] Backscatter verhindern

[sonja at pondus.ch]

Hallo

Ich habe eine Frage zu Backscatter-Mails: Ich habe einen Postfix der Mails
über MySql an verschiedene Domains weiterleitet (alles auf der gleichen
Maschine). Local_recipient_maps sind leer, d.h. alles läuft über virtual.
Die Mails werden dann von maildrop ausgeliefert.

Jetzt nimmt Postfix erstmal alle Mails für seine Relay-Domains an und
falsche User werden erst von Maildrop erkannt. Ich denke, das wird so gen.
Backscatter generieren oder irre ich mich? Falls dies so, wie löse ich das
Problem am Besten?

Vielen Dank und Gruss

Sonja

PS: Hier noch meine postconf -n:

alias_maps = hash:/etc/aliases
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
defer_transports =
disable_dns_lookups = no
html_directory = no
inet_interfaces = 172.17.10.4, 127.0.0.1
local_recipient_maps =
local_transport = local
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command =
mailbox_size_limit = 51200000
mailbox_transport =
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains = no
masquerade_exceptions = root
message_size_limit = 10240000
mydestination = $myhostname     $mydomain       localhost      
localhost.$mydomain     web2.$mydomain
mydomain = domain1.ch
myhostname = mail.hostinghouse.ch
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/packages/postfix/README_FILES
relay_domains = domain1.ch domain2.ch domain3.com
relayhost =
relocated_maps = hash:/etc/postfix/relocated
sample_directory = /usr/share/doc/packages/postfix/samples
sender_canonical_maps = hash:/etc/postfix/sender_canonical
sendmail_path = /usr/sbin/sendmail
setgid_group = maildrop
smtp_sasl_auth_enable = no
smtp_use_tls = no
smtpd_client_restrictions =
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_recipient_restrictions =
  check_sender_access hash:/etc/postfix/access     permit_mynetworks      
reject_non_fqdn_hostname        reject_unauth_destination 
reject_unknown_sender_domain    reject_unknown_recipient_domain
reject_unauth_pipelining        check_recipient_access
hash:/etc/postfix/roleaccount_exeptions     reject_rbl_client
list.dsbl.org        reject_rbl_client sbl-xbl.spamhaus.org  
reject_rbl_client cbl.abuseat.org        check_sender_access
hash:/etc/postfix/common_spam_sender_domains
smtpd_sasl_auth_enable = no
smtpd_sender_restrictions =
smtpd_use_tls = no
strict_rfc821_envelopes = no
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 450
virtual_gid_maps = mysql:/etc/postfix/ids.mysql
virtual_mailbox_base = /var/spool/maildirs
virtual_mailbox_maps = mysql:/etc/postfix/mailbox.mysql
virtual_minimum_uid = 5000
virtual_transport = maildrop:
virtual_uid_maps = mysql:/etc/postfix/ids.mysql