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8.2

Postfix configuration error (451 4.3.5 Server configuration problem)

Asked by julianmatz in Postfix, Linux, Debian Linux

Tags: Postfix, Courier, Debian Etch

Hi! Lately, I've been seeing these errors in my log. Some people have reported that mails are being returned undelivered.

Jan 21 00:02:45 localhost postfix/smtpd[28622]: NOQUEUE: reject: RCPT from mail.sunbeam.co.nz[203.167.253.34]: 451 4.3.5 Server configuration problem; from=<****@aol.com> to=<****@****.ie> proto=ESMTP helo=<quantum.sunbeam.co.nz>

I know this error is very generic, but I couldn't find anything else in my syslog, and I was hoping a Postfix expert or experts could help troubleshoot.

Any research I've done into this error seems to be pointing towards Postfix Policy Daemon - postfix-policyd-spf-perl - for SPF checking. I followed this guide to implement this and up until now it seems to have been working:

http://www.howtoforge.com/postfix_spf

Thanks in advance for any help. My Postfix main.cf is attached below. 
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# see /usr/share/postfix/main.cf.dist for a commented, fuller
# version of this file.
 
# Do not change these directory settings - they are critical to Postfix
# operation.
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
program_directory = /usr/lib/postfix
 
home_mailbox = Maildir/
 
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
setgid_group = postdrop
biff = no
 
smtpd_helo_required = yes
 
# appending .domain is the MUA's job.
append_dot_mydomain = no
myhostname = mail.localhost.net
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
relayhost =
mynetworks = 127.0.0.0/8
mailbox_command = procmail -a "$EXTENSION"
recipient_delimiter = +
mydestination = $myhostname
relay_domains = $mydestination
 
smtpd_client_restrictions =
        check_client_access hash:/etc/postfix/access
 
smtpd_sender_restrictions =
        hash:/etc/postfix/access, reject_unknown_sender_domain
 
smtpd_recipient_restrictions = hash:/etc/postfix/access, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_policy_service unix:private/policy, reject_rbl_client bl.spamcop.net
 
default_privs = mail
#mailbox_size_limit = 0
message_size_limit = 51200000
mailbox_size_limit = 102400000
smtpd_error_sleep_time = 0
 
#20060923
header_checks = regexp:/etc/postfix/header_checks
 
### CONFIXX POSTFIX ENTRY ###
virtual_maps = hash:/etc/postfix/confixx_virtualUsers, hash:/etc/postfix/confixx_localDomains
### /CONFIXX POSTFIX ENTRY ###
 
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
virtual_alias_maps = hash:/etc/postfix/confixx_virtualUsers, hash:/etc/postfix/confixx_localDomains
inet_protocols = ipv4
#smtpd_sasl_path = /etc/postfix/sasl
 
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[+][-]01/21/09 07:39 PM, ID: 23436257Expert Comment

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About this solution

Zones: Postfix, Linux, Debian Linux
Tags: Postfix, Courier, Debian Etch
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Solution Provided By: bevhost
Participating Experts: 1
Solution Grade: A
 
[+][-]01/27/09 07:47 PM, ID: 23483423Author Comment

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