Hello! I have installed postfix 2.3.6. on my server. For some time I have a problem with spam: the server is used to send spam by unauthorized users. Most spam is sent from an address localhost.mydomain.tld where mydomain.tld course is swapped for my domain. Server URL is a myserver.mydomain.tld. Practically, I do not see spam sent from this address. For this reason, a lot of public servers reject emails from my server. How can I solve this problem? Best regards* chrees ps. I attach the configuration of postfix (main.cf) Code: queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/lib/postfix mail_owner = postfix myhostname = myserver.mydomain.tld mydomain = mydomain.tld myorigin = $myhostname inet_interfaces = all mydestination = $myhostname unknown_local_recipient_reject_code = 550 mynetworks = 127.0.0.0/8 :relay_domains = $mydestination home_mailbox = .maildir/ smtpd_banner = $myhostname System local_destination_concurrency_limit = 2 default_destination_concurrency_limit = 20 debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin xxgdb $daemon_directory/$process_name $process_id & sleep 5 sendmail_path = /usr/sbin/sendmail newaliases_path = /usr/bin/newaliases mailq_path = /usr/bin/mailq setgid_group = postdrop html_directory = /usr/share/doc/postfix-2.3.6/html manpage_directory = /usr/share/man sample_directory = /etc/postfix home_mailbox = .maildir/ smtpd_sasl_auth_enable = yes smtpd_sasl2_auth_enable = yes smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_local_domain = smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination smtp_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_use_tls = yes smtpd_tls_key_file = /etc/ssl/postfix/key.pem smtpd_tls_cert_file = /etc/ssl/postfix/cert.pem smtpd_tls_CAfile = /etc/ssl/postfix/ca.pem smtpd_tls_loglevel = 3 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom message_size_limit = 150000000 mailbox_size_limit = 200000000 virtual_mailbox_limit = 200000000 local_transport = local local_recipient_maps = $alias_maps $virtual_mailbox_maps unix:passwd.byname virtual_alias_maps = mysql:/etc/postfix/mysql/mysql_virtual_alias_maps.cf virtual_alias_domains = $virtual_alias_maps virtual_uid_maps = static:1000 virtual_gid_maps = static:1000 virtual_minimum_uid = 1000 virtual_mailbox_base = / virtual_mailbox_domains = mysql:/etc/postfix/mysql/mysql_virtual_domains_maps.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql/mysql_virtual_mailbox_maps.cf transport_maps = mysql:/etc/postfix/mysql/mysql_transport.cf biff = no empty_address_recipient = MAILER-DAEMON queue_minfree = 120000000 maximal_queue_lifetime = 6h delay_warning_time = 0h
are everything set correct with mydomain.tld and FQDN of the server it easy to get in RBL's with incomplete server setup if you send mails (wiht -f) I got one vbulletin forum which got that function you can manually troubleshoot every reject You need manually unblock your IP/s from RBLs http://www.anti-abuse.org/multi-rbl-check/ (but only after problem is solved) there is email by hours limit in cpanel one solution i found in these forums for ISPConfig and postfix is http://www.policyd.org/ (use forum search for integration tips there are several topics here) so even some of your sites got hacked and spam is send you can got a policy to be send for example no more than 50 emails per hour or no more than 500 for the day from a domain so yo do not get in trouble with RBLs... or not in big one you can choose lower limits for more paranoid setup
