From: H. Wade Minter (minterlunenburg.org)
Date: Tue Mar 06 2007 - 12:23:49 CST

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I've set up a new mail server for a client with Postfix 2.2.9 on SuSE
Enterprise Server 10. I'm running into an odd issue that I haven't
seen before - an itermittent delay between connecting to port 25 and
receiving the SMTP banner. That leads me to believe that it's
something in my postfix config. I'll restart postfix, and it'll seem
to be fine, only to revert to delays the next time I check.

The system has a routable IP address, and is serving both internet
clients and connections from private addresses inside. It's also
running amavisd-new.

I'm attaching the output of postconf -n, sanitized of identifying
details, in the hopes that someone will be able to give me a pointer
on where to investigate. My first thought was reverse-DNS lookups,
but those appear to run fine with the "host" command.

alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
biff = no
broken_sasl_auth_clients = yes
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
debug_peer_list = 152.2.91.41
defer_transports =
disable_dns_lookups = no
disable_mime_output_conversion = no
html_directory = /usr/share/doc/packages/postfix/html
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mail_spool_directory = /var/mail
mailbox_command =
mailbox_size_limit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains =
masquerade_exceptions = root
message_size_limit = 10240000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = example.com
myhostname = mail.example.com
mynetworks = their_network/28 127.0.0.0/8 192.168.0.0/16
mynetworks_style = subnet
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/packages/postfix/README_FILES
relayhost =
relocated_maps = hash:/etc/postfix/relocated
sample_directory = /usr/share/doc/packages/postfix/samples
sender_canonical_maps = hash:/etc/postfix/sender_canonical
sendmail_path = /usr/sbin/sendmail
setgid_group = maildrop
smtp_use_tls = no
smtpd_client_restrictions =
smtpd_helo_required = no
smtpd_helo_restrictions =
smtpd_recipient_restrictions = check_recipient_maps,
check_client_access hash:/etc/postfix/access,
permit_sasl_authenticated, permit_mynetworks,
reject_unauth_destination, reject_rbl_client sbl-
xbl.spamhaus.org, reject_rbl_client dnsbl.njabl.org,
reject_rbl_client list.dsbl.org, reject_rbl_client
cbl.abuseat.org, reject_rbl_client combined.njabl.org,
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions = hash:/etc/postfix/access
smtpd_use_tls = no
strict_8bitmime = no
strict_rfc821_envelopes = no
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550
virtual_alias_domains = hash:/etc/postfix/virtual
virtual_alias_maps = hash:/etc/postfix/virtual

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