Hi, I have a seen a few of these messages popping up in the mail.log over the past weeks. Would someone tell me whether this is a configuration problem with my server, or a remote site? The 451 error has appeared from a couple of sites, hence I wonder if the problem lies with my site. In the case of the example below, the message is delivered.
Best regards, Simon. Version: postfix 2.7.1-1+squeeze1 # grep 91545817DA mail.log.1 Sep 12 17:52:19 logout postfix/smtpd[28483]: 91545817DA: client=unknown[62.11.22.33], sasl_method=PLAIN, sasl_username=scrubbed_u...@example.com Sep 12 17:52:19 logout postfix/cleanup[28473]: 91545817DA: replace: header Received: from [127.0.0.1] (unknown [62.11.22.33])??(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))??(No client certificate requested)??by example.com (Postfix) with ESMTPSA id 91545817DA from unknown[62.11.22.33]; from=<scrubbed_u...@example.com> to=<scrubbed_u...@soekris.eu> proto=ESMTP helo=<[127.0.0.1]>: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost Sep 12 17:52:19 logout postfix/cleanup[28473]: 91545817DA: message-id=<4e6e2ad2.8010...@example.com> Sep 12 17:52:21 logout postfix/qmgr[12672]: 91545817DA: from=<scrubbed_u...@example.com>, size=31400, nrcpt=1 (queue active) Sep 12 17:52:21 logout postfix/smtp[28488]: 91545817DA: to=<scrubbed_u...@soekris.eu>, relay=mail.gigahost.dk[89.186.169.167]:25, delay=1.9, delays=1.5/0.01/0.2/0.21, dsn=4.2.0, status=deferred (host mail.gigahost.dk[89.186.169.167] said: 450 4.2.0 <scrubbed_u...@soekris.eu>: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/soekris.eu.html (in reply to RCPT TO command)) Sep 12 17:58:52 logout postfix/qmgr[12672]: 91545817DA: from=<scrubbed_u...@example.com>, size=31400, nrcpt=1 (queue active) Sep 12 17:58:54 logout postfix/smtp[28509]: 91545817DA: to=<scrubbed_u...@soekris.eu>, relay=mail.gigahost.dk[89.186.169.167]:25, delay=394, delays=393/0.02/0.12/1, dsn=4.3.5, status=deferred (host mail.gigahost.dk[89.186.169.167] said: 451 4.3.5 Server configuration problem (in reply to RCPT TO command)) Sep 12 18:08:52 logout postfix/qmgr[12672]: 91545817DA: from=<scrubbed_u...@example.com>, size=31400, nrcpt=1 (queue active) Sep 12 18:08:53 logout postfix/smtp[28548]: 91545817DA: to=<scrubbed_u...@soekris.eu>, relay=mail.gigahost.dk[89.186.169.167]:25, delay=994, delays=993/0.02/0.12/0.21, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 1CEE44E2943C) Sep 12 18:08:53 logout postfix/qmgr[12672]: 91545817DA: removed # postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no body_checks = regexp:/etc/postfix/body_checks.regexp bounce_template_file = /etc/postfix/bounce.cf broken_sasl_auth_clients = yes config_directory = /etc/postfix disable_vrfy_command = yes header_checks = pcre:/etc/postfix/header_checks inet_interfaces = all mailbox_size_limit = 0 message_size_limit = 20480000 milter_connect_macros = j {daemon_name} v {client_addr} _ milter_default_action = tempfail mime_header_checks = regexp:/etc/postfix/mime_header_checks mydestination = myhostname = example.com mynetworks = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname non_smtpd_milters = unix:/dkim-filter/dkim-filter.sock readme_directory = no recipient_delimiter = + relayhost = smtp_helo_timeout = 60s smtp_mail_timeout = 60s smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_connection_count_limit = 50 smtpd_client_connection_rate_limit = 50 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname, reject_unlisted_recipient, reject_unlisted_sender, regexp:/etc/postfix/helo.regexp, permit smtpd_milters = unix:/clamav/clamav-milter.ctl,unix:/spamass/spamass.sock,unix:/dkim-filter/dkim-filter.sock smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated, reject_unauth_destination, check_recipient_access cidr:/etc/postfix/whitelist, reject_non_fqdn_sender, reject_rbl_client hostkarma.junkemailfilter.com=127.0.0.2, reject_rbl_client sbl-xbl.spamhaus.org smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_sender_restrictions = hash:/etc/postfix/access smtpd_tls_CAfile = scrubbed smtpd_tls_cert_file = scrubbed smtpd_tls_key_file = scrubbed smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes strict_rfc821_envelopes = yes transport_maps = hash:/etc/postfix/transport unknown_address_reject_code = 554 unknown_client_reject_code = 554 unknown_hostname_reject_code = 554 virtual_alias_maps = proxy:mysql:/etc/postfix/sql/scrubbed.cf, proxy:mysql:/etc/postfix/sql/scrubbed.cf, proxy:mysql:/etc/postfix/sql/scrubbed.cf virtual_mailbox_domains = proxy:mysql:/etc/postfix/sql/scrubbed.cf virtual_mailbox_maps = mysql:/etc/postfix/sql/scrubbed.cf virtual_transport = dovecot-spamass