Hello, Sometimes postfix block one sender when he try to send email from his mobile using 4G, the IP's on 4G Networks are constantly changing so I know is pretty difficult to find out which IP's are listed on RBL and which ones are not. Is there any way I can tell postfix to always sent emails from this user regarding if the IP that he is using are listed on RBL?, Is supposed that if the smtp auth is correct the sender would be able to sent email even if the IP's are RBL listed or I am wrong? Thanks in advance Postfix Configuration: root@mail log]# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases body_checks = regexp:/etc/postfix/body_checks broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix content_filter = amavis:[127.0.0.1]:10024 daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 enable_original_recipient = no header_checks = regexp:/etc/postfix/header_checks html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailbox_size_limit = 0 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man message_size_limit = 0 mime_header_checks = regexp:/etc/postfix/mime_header_checks mydestination = natsrv.mydomain.com, mail.mydomain.com, localhost, localhost.localdomain myhostname = mail.mydomain.com mynetworks = 127.0.0.0/8 [::1]/128 nested_header_checks = regexp:/etc/postfix/nested_header_checks newaliases_path = /usr/bin/newaliases.postfix 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 queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES receive_override_options = no_address_mappings relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf relayhost = sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf smtpd_delay_reject = yes smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_helo_hostname smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination, reject_invalid_hostname, reject_unknown_recipient_domain, reject_unauth_pipelining, reject_rbl_client zen.spamhaus.org, reject_rbl_client b.barracudacentral.org, reject_rbl_client bl.spamcop.net smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sender_restrictions = check_sender_access mysql:/etc/postfix/mysql-sender.cf, reject_rbl_client zen.spamhaus.org smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_tls_security_level = may smtpd_use_tls = yes transport_maps = proxy:mysql:/etc/postfix/mysql-virtual_transports.cf unknown_local_recipient_reject_code = 550 virtual_alias_domains = virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, mysql:/etc/postfix/mysql-virtual_email2email.cf virtual_gid_maps = static:5000 virtual_mailbox_base = /var/vmail virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf virtual_transport = maildrop virtual_uid_maps = static:5000
The easiest way is, that this client uses port 587 instead of 25. 587 is the standard-port für MUA, while 25 should be used for other MTA only.
