From: Alex Rosenbaum (alexnetmacros.com)
Date: Mon Aug 25 2003 - 08:47:54 CDT

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Hello:

We are having problems receiving e-mails from a specific domain. They are
rejected with a 450 Domain Not Found:

In: MAIL FROM:<xxxxxxxxxxxbellsouth.net> SIZE=811
Out: 250 Ok
In: RCPT TO:<xxxxxxxxxxxxxxxxxxxxxx.com>
Out: 450 <xxxxxxxxxxxbellsouth.net>: Sender address rejected: Domain not
found

I know that 450 means postfix will retry delivery, but these messages never
get to their destination.

Not sure why this is happening, since dig consitently returns correct
results. Here is the output from dig:

dig MX bellsouth.net

; <<>> DiG 8.3 <<>> MX bellsouth.net
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 6
;; QUERY SECTION:
;; bellsouth.net, type = MX, class = IN

;; ANSWER SECTION:
bellsouth.net. 1h47m55s IN MX 10 mx01.mail.bellsouth.net.
bellsouth.net. 1h47m55s IN MX 10 mx00.mail.bellsouth.net.

;; AUTHORITY SECTION:
bellsouth.net. 2h36m4s IN NS ns.atl.bellsouth.net.
bellsouth.net. 2h36m4s IN NS ns.mia.bellsouth.net.
bellsouth.net. 2h36m4s IN NS ns.rdu.bellsouth.net.
bellsouth.net. 2h36m4s IN NS ns.bellsouth.net.

;; ADDITIONAL SECTION:
mx00.mail.bellsouth.net. 1h38m57s IN A 205.152.59.32
mx01.mail.bellsouth.net. 1h38m57s IN A 205.152.59.33
ns.atl.bellsouth.net. 1d18h1m33s IN A 205.152.0.20
ns.mia.bellsouth.net. 2h46m26s IN A 205.152.144.252
ns.rdu.bellsouth.net. 2h46m26s IN A 205.152.244.252
ns.bellsouth.net. 2h46m26s IN A 205.152.0.5

;; Total query time: 2 msec
;; FROM: <some domain> to SERVER: default -- <some ip>
;; WHEN: Thu Aug 21 16:59:54 2003
;; MSG SIZE sent: 31 rcvd: 254

Any ideas?

Thanks,

Alex

Output of postconf -n:

2bounce_notice_recipient = postmasterxxxxxxxxxxxxx.com
alias_database = hash:$config_directory/aliases
alias_maps = hash:$config_directory/aliases
biff = no
body_checks = regexp:$config_directory/body_checks.regexp
bounce_notice_recipient = postmasterxxxxxxxxxxxxxx.com
command_directory = /opt/postfix-20010228.3_2/sbin
daemon_directory = /opt/postfix-20010228.3_2/libexec/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 100
default_privs = nobody
delay_notice_recipient = postmasterxxxxxxxxxxxxxxx.com
disable_vrfy_command = yes
double_bounce_sender = double-bounce
empty_address_recipient = MAILER-DAEMON
error_notice_recipient = postmasterxxxxxxxxxxxx.com
header_checks = regexp:$config_directory/header_checks.regexp
local_destination_concurrency_limit = 2
mail_owner = postfix
mail_spool_directory = /var/mail
maps_rbl_domains = blackholes.mail-abuse.org,
dialups.mail-abuse.org,
relays.mail-abuse.org
masquerade_domains = $mydomain
maximal_queue_lifetime = 1d
mydestination = $myhostname, localhost.$mydomain
myhostname = mail.xxxxxxxxxxxxxxx.com
mynetworks = $config_directory/mynetworks
myorigin = $myhostname
notify_classes = resource, software, bounce,
         2bounce, delay, policy, protocol
queue_directory = /var/spool/postfix
relay_domains = $mynetworks,
hash:$config_directory/relay_domains.map
smtp_always_send_ehlo = yes
smtpd_banner = $myhostname ESMTP
smtpd_client_restrictions = permit_mynetworks,
hash:$config_directory/client-filter.map,
hash:$config_directory/spamlist.map
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
reject_invalid_hostname
smtpd_recipient_restrictions = permit_mynetworks, h
hash:$config_directory/recipient-filter.map,
reject_non_fqdn_recipient,
reject_unknown_recipient_domain,
check_relay_domains
smtpd_sender_restrictions = permit_mynetworks,
hash:$config_directory/sender-filter.map,
reject_unknown_sender_domain, reject_non_fqdn_sender,
reject_maps_rbl
strict_rfc821_envelopes = yes
transport_maps = hash:$config_directory/transport.map
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
virtual_maps = hash:$config_directory/virtual.map

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