From: TechTalk (techtalkanthemfx.com)
Date: Thu Apr 17 2008 - 17:07:13 CDT

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Hi

Some users on my mail system are reporting that their mail is being
blocked and returned with the "553
Open mailing script " error. Full error message below. I've gone to
the unblock website to request we be unblocked, but is there a way to
ensure that my postfix system (Mac OS X 10.3.9, postfix 2.0.10). I've
got the "The book of Postfix" and while mostly lurking on this list I
have tried to implement stringent anti-spam controls through
appropriate smtp restrictions. It's a fine balance between applying
strict controls that don't block legitimate from getting through. SPAM
is still leaking through, but I am stopping a lot.

Thanks,

Mat X
Sys Admin
AnthemFX.com

<snip>

The Postfix program
<help3ride.com>: host smtp.where.secureserver.net[64.202.166.12]
said: 553
Open mailing script wwwanthemfx.com.
<http://unblock.secureserver.net/?ip=66.119.164.107> (in reply to RCPT
TO
command)
Reporting-MTA: dns; anthemfx.com
Arrival-Date: Thu, 17 Apr 2008 12:12:27 -0700 (PDT)
Final-Recipient: rfc822; help3ride.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host
smtp.where.secureserver.net[64.202.166.12]
said: 553 Open mailing script wwwanthemfx.com.
<http://unblock.secureserver.net/?ip=66.119.164.107> (in reply to RCPT
TO

<snip>

And for full disclosure here's my postconf output:

alias_maps = hash:/etc/aliases,hash:/var/mailman/data/aliases
always_bcc =
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
enable_server_options = yes
inet_interfaces = all
luser_relay = postmasteranthemfx.com
mail_owner = postfix
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
maps_rbl_domains = zen.spamhaus.org
message_size_limit = 20971520
mydestination = $myhostname,localhost.$mydomain,mail.anthemfx.com
mydomain_fallback = localhost
myhostname = anthemfx.com
mynetworks = 127.0.0.1/32,66.119.164.107,66.119.164.106,192.168.1.2
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
owner_request_special = no
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpd_client_restrictions = hash:/etc/postfix/
smtpdreject,reject_rbl_client cbl.abuseat.org,reject_maps_rbl
smtpd_enforce_tls = no
smtpd_helo_required = yes
smtpd_helo_restrictions =
permit_mynetworks
,reject_non_fqdn_hostname,reject_invalid_hostname,permit
smtpd_pw_server_security_options = cram-md5
smtpd_recipient_restrictions =
permit_sasl_authenticated
,permit_mynetworks,reject_unauth_destination,permit
smtpd_sasl_auth_enable = yes
smtpd_sender_restrictions =
permit_mynetworks
,reject_non_fqdn_sender
,reject_unknown_sender_domain,reject_rhsbl_sender dsn.rfc-
ignorant.org,permit
smtpd_tls_loglevel = 0
smtpd_use_pw_server = yes
smtpd_use_tls = no
unknown_local_recipient_reject_code = 550

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