From: Yogesh Talekar (ytalekar1yahoo.com)
Date: Mon Mar 21 2005 - 20:29:04 CST

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Hello all,

We are running postfix-1.1.11-114 on SuSE Enterprise
8.0

Recently, we are having a problem with only one
perticular domain, rather only their primary mail
exchange server. All outgoing mails going towards this
server are giving error like this:

Mar 22 01:54:07 c01lp016 postfix-out/smtp[21889]:
1DA06663A: to=<abcdremote-domain.com>,
relay=mail.remote-domain.com[aa.bb.cc.dd],
delay=302543, status=deferred (host
mail.remote-domain.com[aa.bb.cc.dd] said: 451 Unable
to complete command, DNS not available or timed out)

Also, when I try manual SMTP telnet to that server, it
just doesn't respond at all after "mail from" command.
Typical response of the remote server is pasted below:
------------
YOGIBH-~:> telnet mail.remote-domain.com 25
Trying aa.bb.cc.dd ...
Connected to mail.remote-domain.com.
Escape character is '^]'.
helo myserver.mydomain.com
220
***************************************************************************22*****200**02********0000
mail from: msg-supportmydomain.com
-------------

I tried traceroute to the remote server. But it seems
that they are filtering traceroutes on firewall. The
remote domain has also somplained that they are also
not able to send mails to us.

Everything was working fine before a week.

Does anyone has any clues? Please advice ..

Thanks in advance

--yogesh

---------------------postconf -n
----------------------
alternate_config_directories = /etc/postfix-in
/etc/postfix-out
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter =
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 20
default_destination_recipient_limit = 50
default_extra_recipient_limit = 1000
default_minimum_delivery_slots = 3
default_process_limit = 100
default_recipient_limit = 10000
defer_transports =
disable_dns_lookups = no
inet_interfaces = aa.bb.32.71
initial_destination_concurrency = 5
mail_name = PONL Mail Server
mail_owner = postfix
mail_spool_directory = /var/mail
mailbox_command =
mailbox_transport =
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = c01lp016.mydomain.com
mydomain = mydomain.com
myhostname = mail1-in.mydomain.com
mynetworks = aa.bb.36.50, aa.bb.32.71
mynetworks_style = host
newaliases_path = /usr/sbin/sendmail
qmgr_fudge_factor = 100
qmgr_message_active_limit = 10000
qmgr_message_recipient_limit = 10000
qmgr_message_recipient_minimum = 10
qmgr_site_hog_factor = 100
queue_directory = /var/spool/postfix
queue_minfree = 10240000
readme_directory =
/usr/share/doc/packages/postfix/README_FILES
relay_domains = hash:/etc/postfix/relay_domains
relayhost = aa.bb.36.25
sample_directory =
/usr/share/doc/packages/postfix/samples
sender_canonical_maps =
hash:/etc/postfix/sender_canonical,
     ldap:senderldap,
ldap:senderldap2
sendmail_path = /usr/sbin/sendmail
setgid_group = maildrop
smtp_bind_address = aa.bb.32.71
smtpd_banner = mail1-in.mydomain.com ESMTP $mail_name
smtpd_client_restrictions =
smtpd_helo_required = no
smtpd_helo_restrictions =
smtpd_recipient_limit = 1000
smtpd_recipient_restrictions = permit_mynetworks
 reject_unauth_destination check_sender_access
hash:/etc/postfix/sender_access
strict_rfc821_envelopes = no
transport_maps = hash:/etc/postfix/transport
virtual_maps = hash:/etc/postfix/virtual,
ldap:corpldap , ldap:genericldap

                
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