I put the result of postconf -n I will put it back, I will also place the most detailed result of the postfix log
* Postfix LOG:* Mar 18 21:03:27 server postfix/smtpd[28381]: warning: unknown[DD.D.D.DD]: SASL LOGIN authentication failed: AAAAAAA Mar 18 21:03:27 server postfix/smtpd[26211]: warning: unknown smtpd restriction: "combined.rbl.msrbl.net" *Mar 18 21:03:27 server postfix/smtpd[26211]: NOQUEUE: reject: RCPT from unknown[DDD.D.DDD.DDD]: 451 4.3.5 Server configuration error; from=<aaa...@aaaaaaaaa.com> to=<aaaa...@aaaaa.com> proto=ESMTP helo=<[DD.D.D.DD]>* Mar 18 21:03:27 server postfix/smtpd[28381]: lost connection after AUTH from unknown[DD.D.D.DD] Mar 18 21:03:27 server postfix/smtpd[28381]: disconnect from unknown[DD.D.D.DD] Mar 18 21:03:28 server postfix/cleanup[30157]: C1077620DF6: message-id=<20170319010328.c1077620...@aaaaaaaaa.com> *Postconf - N: * alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases allow_percent_hack = no bounce_queue_lifetime = 30m broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 default_destination_concurrency_limit = 776 default_destination_recipient_limit = 776 default_process_limit = 776 delay_warning_time = 2h fast_flush_purge_time = 30m fast_flush_refresh_time = 15m home_mailbox = Maildir/ html_directory = no mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME mailbox_size_limit = 0 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man maximal_backoff_time = 1000s maximal_queue_lifetime = 2h message_size_limit = 0 minimal_backoff_time = 300s mydestination = /etc/postfix/mydestination mydomain = AAAAAAAA.AAA mynetworks = 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix qmgr_message_active_limit = 40000 qmgr_message_recipient_limit = 40000 readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES recipient_bcc_maps = hash:/etc/postfix/recipient_bcc relay_domains = $mydestination, bonofull.com, maillion.net, unityfull.com sample_directory = /usr/share/doc/postfix-2.3.3/samples sender_bcc_maps = hash:/etc/postfix/bcc sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_connection_cache_on_demand = no smtp_destination_concurrency_limit = 400 smtp_mx_session_limit = 776 smtp_use_tls = yes smtpd_banner = $mydomain smtpd_client_connection_count_limit = 400 smtpd_client_restrictions = permit_mynetworks permit_inet_interfaces permit_tls_all_clientcerts reject_rbl_client reject_rbl_client reject_rbl_client reject_rbl_client reject_rbl_client reject_rbl_client reject_rbl_client psbl.surriel.com reject_rhsbl_client bl.spamcop.net combined.rbl.msrbl.net reject_rbl_client reject_rhsbl_client reject_rbl_client reject_rhsbl_client bl.spamcannibal.org smtpd_peername_lookup = no smtpd_recipient_limit = 776 smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated permit_inet_interfaces check_relay_domains reject_sender_login_mismatch smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_exceptions_networks = !DDD.DD.DD.D, DDD.DDD.D.D/DD smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_tls_security_options = $smtpd_sasl_security_options smtpd_sasl_type = dovecot smtpd_sender_login_maps = hash:/etc/postfix/controlled_envelope_senders smtpd_tls_CAfile = /home/maillion/ssl.ca smtpd_tls_cert_file = /home/AAAAAAAA/ssl.cert smtpd_tls_key_file = /home/AAAAAAAA/ssl.key smtpd_tls_security_level = may unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual Please, help me -- View this message in context: http://postfix.1071664.n5.nabble.com/NOQUEUE-reject-451-4-3-5-Server-configuration-error-tp89530p89535.html Sent from the Postfix Users mailing list archive at Nabble.com.