Postfix-2.11.1
CentOS-6.6

In the process doing some DANE related investigations I ran across this sort
of thing in the /var/log/maillog file:


<---
Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 0A7EC60D8A: from=<j...@nyc.rr.com>,
size=4261, nrcpt=1 (queue active)

Dec  9 15:12:08 inet08 postfix/smtp[3670]: fatal: shared lock
active/0A7EC60D8A: Resource temporarily unavailable

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 22D74606D7: from=<>, size=49528,
nrcpt=1 (queue active)

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 8DD5060F81:
from=<warineur-boun...@mailman.halisp.net>, size=8459, nrcpt=34 (queue active)

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 8129F60F76:
from=<bounce_ckomha-consult=harte-lyne...@cp20.com>, size=16178, nrcpt=1
(queue active)

Dec  9 15:12:08 inet08 postfix/smtp[3758]: fatal: shared lock
active/8DD5060F81: Resource temporarily unavailable

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 9048A604F0:
from=<bounces+909111-1753-grognard=grognard....@sendgrid.info>, size=6343,
nrcpt=1 (queue active)

Dec  9 15:12:08 inet08 postfix/smtp[3778]: 8129F60F76:
to=<cons...@harte-lyne.ca>, relay=xx.hamilton.harte-lyne.ca[216.185.71.xx]:25,
delay=543, delays=543/0.12/0.06/0.12, dsn=2.0.0, status=sent (250 2.0.0 Ok:
queued as 6848F8B143)

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 8129F60F76: removed

Dec  9 15:12:08 inet08 postfix/smtp[3781]: 9048A604F0:
to=<grogn...@grognard.org>, relay=xx.hamilton.harte-lyne.ca[216.185.71.xx]:25,
delay=561, delays=561/0.26/0.12/0.2, dsn=5.1.1, status=bounced (host
inetxx.hamilton.harte-lyne.ca[216.185.71.xx] said: 550 5.1.1
<grogn...@grognard.org>: Recipient address rejected: User unknown in virtual
mailbox table (in reply to RCPT TO command))

Dec  9 15:12:08 inet08 postfix/cleanup[3669]: CE151601CB:
message-id=<20141209201208.ce15160...@inet08.hamilton.harte-lyne.ca>

Dec  9 15:12:08 inet08 postfix/bounce[3776]: 9048A604F0: sender non-delivery
notification: CE151601CB

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: CE151601CB: from=<>, size=8725,
nrcpt=1 (queue active)

Dec  9 15:12:08 inet08 postfix/qmgr[3198]: 9048A604F0: removed

Dec  9 15:12:09 inet08 postfix/qmgr[3198]: warning: private/relay socket:
malformed response

Dec  9 15:12:09 inet08 postfix/qmgr[3198]: warning: transport relay failure --
see a previous warning/fatal/panic logfile record for the problem description

Dec  9 15:12:09 inet08 postfix/master[3195]: warning: process
/usr/libexec/postfix/smtp pid 3670 exit status 1

Dec  9 15:12:09 inet08 postfix/qmgr[3198]: warning: private/smtp socket:
malformed response

Dec  9 15:12:09 inet08 postfix/qmgr[3198]: warning: transport smtp failure --
see a previous warning/fatal/panic logfile record for the problem description
Dec  9 15:12:09 inet08 postfix/master[3195]: warning: process
/usr/libexec/postfix/smtp pid 3758 exit status 1

Dec  9 15:12:09 inet08 postfix/error[3782]: 0A7EC60D8A:
to=<dayfp...@abmdirect.com>, relay=none, delay=273161,
delays=273160/1.1/0/0.17, dsn=4.3.0, status=deferred (unknown mail transport
error)

Dec  9 15:12:09 inet08 postfix/error[3783]: 8DD5060F81:
to=<harun.bhai...@bigfoot.com>, relay=none, delay=357117,
delays=357116/1.2/0/0.1, dsn=4.3.0, status=deferred (unknown mail transport
error)

Dec  9 15:12:10 inet08 postfix/smtp[3765]: CE151601CB:
to=<bounces+909111-1753-grognard=grognard....@sendgrid.info>,
relay=mx.sendgrid.net[198.37.145.251]:25, delay=1.4, delays=0.11/0/1/0.29,
dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 121BA201796)

Dec  9 15:12:10 inet08 postfix/qmgr[3198]: CE151601CB: removed

Dec  9 15:12:13 inet08 postfix/anvil[3221]: statistics: max connection rate
69/60s for (smtp:151.237.190.118) at Dec  9 15:07:54

Dec  9 15:12:13 inet08 postfix/anvil[3221]: statistics: max connection count 2
for (smtp:183.145.188.183) at Dec  9 15:05:30

Dec  9 15:12:13 inet08 postfix/anvil[3221]: statistics: max cache size 8 at
Dec  9 15:11:40

--->

The transport mapping error is deliberate on our part.  ABMDIRECT.com does not
go anywhere.  That said, perhaps we should set it to something else.

The issue I am concerned about is this:

Dec  9 15:12:09 inet08 postfix/qmgr[3198]: warning: private/relay socket:
malformed response

I do not know what this means and I cannot find any obvious way how to find
out.  A postfix -vv check shows this and find no errors:

<---
postfix -v check
postfix: name_mask: all
postfix: inet_addr_local: configured 6 IPv4 addresses
postfix: inet_addr_local: configured 3 IPv6 addresses
[root@inet08 ~]# postfix -vv check
postfix: dict_register: mail_dict 1
postfix: dict_update: config_directory = /etc/postfix
postfix: dict_load_fp: soft_bounce = no
postfix: dict_load_fp: config_directory = /etc/postfix
postfix: dict_load_fp: command_directory = /usr/sbin
postfix: dict_load_fp: daemon_directory = /usr/libexec/postfix
postfix: dict_load_fp: data_directory = /var/lib/postfix
postfix: dict_load_fp: inet_interfaces = localhost, 
inet08.hamilton.harte-lyne.ca
postfix: dict_load_fp: inet_protocols = all
postfix: dict_load_fp: mydestination =
postfix: dict_load_fp: unknown_local_recipient_reject_code = 550
postfix: dict_load_fp: mynetworks = 216.185.71.0/26, 209.47.176.0/26, 
127.0.0.0/8
postfix: dict_load_fp: relay_domains = hash:/etc/postfix/relay_domains
postfix: dict_load_fp: alias_maps = hash:/etc/aliases
postfix: dict_load_fp: recipient_delimiter = +
postfix: dict_load_fp: home_mailbox = Maildir/
postfix: dict_load_fp: mail_spool_directory = /var/spool/mail
postfix: dict_load_fp: smtpd_helo_required = yes
postfix: dict_load_fp: disable_vrfy_command = yes
postfix: dict_load_fp: strict_rfc821_envelopes = yes
postfix: dict_load_fp: rbl_reply_maps = hash:/etc/postfix/rbl_reply
postfix: dict_load_fp: smtpd_helo_restrictions = permit_mynetworks,  
check_helo_access pcre:/etc/postfix/helo_checks.pcre,  
reject_non_fqdn_helo_hostname,   reject_invalid_helo_hostname,  
reject_unknown_helo_hostname,   permit
postfix: dict_load_fp: smtpd_sender_restrictions = permit_mynetworks, 
check_sender_access hash:/etc/postfix/sender_access,  check_sender_mx_access
hash:/etc/postfix/sender_mx_access,  check_sender_ns_access
hash:/etc/postfix/sender_ns_access,  permit_sasl_authenticated, 
reject_non_fqdn_sender,  reject_unknown_sender_domain,  permit
postfix: dict_load_fp: smtpd_client_restrictions = permit
postfix: dict_load_fp: smtpd_recipient_restrictions =
reject_non_fqdn_recipient,  reject_unknown_recipient_domain, 
reject_non_fqdn_sender,  reject_unknown_sender_domain,  permit_mynetworks, 
permit_sasl_authenticated,  reject_invalid_hostname, 
reject_unauth_destination,  reject_unauth_pipelining,  check_policy_service
unix:/var/spool/postfix/postgrey/socket,  check_policy_service
unix:private/policyd-spf,  sleep 1,  permit
postfix: dict_load_fp: policyd-spf_time_limit = 3600
postfix: dict_load_fp: smtpd_data_restrictions = permit_mynetworks, 
reject_multi_recipient_bounce,  reject_unauth_pipelining,  permit
postfix: dict_load_fp: smtpd_timeout = ${stress?10}${stress:120}s
postfix: dict_load_fp: smtpd_starttls_timeout = ${stress?10}${stress:120}s
postfix: dict_load_fp: header_checks = regexp:/etc/postfix/header_checks.regexp
postfix: dict_load_fp: debug_peer_level = 32
postfix: dict_load_fp: debug_peer_list = 216.185.71.25
postfix: dict_load_fp: debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin? ddd
$daemon_directory/$process_name $process_id & sleep 5
postfix: dict_load_fp: sendmail_path = /usr/sbin/sendmail.postfix
postfix: dict_load_fp: newaliases_path = /usr/bin/newaliases.postfix
postfix: dict_load_fp: mailq_path = /usr/bin/mailq.postfix
postfix: dict_load_fp: setgid_group = postdrop
postfix: dict_load_fp: html_directory = no
postfix: dict_load_fp: manpage_directory = /usr/share/man
postfix: dict_load_fp: sample_directory = /usr/share/doc/postfix-2.11.1/samples
postfix: dict_load_fp: readme_directory =
/usr/share/doc/postfix-2.11.1/README_FILES
postfix: dict_load_fp: virtual_alias_maps = hash:/etc/postfix/virtual,        
   regexp:/etc/postfix/virtual.regexp
postfix: dict_load_fp: transport_maps = hash:/etc/postfix/transport
postfix: dict_load_fp: message_size_limit = 20480000
postfix: dict_load_fp: queue_minfree = 40960000
postfix: dict_load_fp: mailman_destination_recipient_limit = 1
postfix: dict_load_fp: content_filter = smtp-amavis:[127.0.0.1]:10024
postfix: dict_load_fp: smtp_use_tls = yes
postfix: dict_load_fp: smtpd_use_tls = yes
postfix: dict_load_fp: smtp_tls_security_level = may
postfix: dict_load_fp: smtpd_tls_security_level = may
postfix: dict_load_fp: smtpd_tls_auth_only = yes
postfix: dict_load_fp: tls_random_source = dev:/dev/urandom
postfix: dict_load_fp: smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
postfix: dict_load_fp: smtp_tls_cert_file =
/etc/pki/tls/certs/ca.harte-lyne.hamilton.smtp.crt
postfix: dict_load_fp: smtp_tls_key_file =
/etc/pki/tls/private/ca.harte-lyne.hamilton.smtp.key
postfix: dict_load_fp: smtpd_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
postfix: dict_load_fp: smtpd_tls_cert_file =
/etc/pki/tls/certs/ca.harte-lyne.hamilton.smtp.crt
postfix: dict_load_fp: smtpd_tls_key_file =
/etc/pki/tls/private/ca.harte-lyne.hamilton.smtp.key
postfix: dict_load_fp: relay_clientcerts = hash:/etc/postfix/relay_clientcerts
postfix: dict_load_fp: smtpd_tls_ask_ccert = yes
postfix: dict_load_fp: smtpd_tls_fingerprint_digest = sha1
postfix: dict_load_fp: smtp_tls_session_cache_database =
btree:/var/lib/postfix/smtp_scache
postfix: dict_load_fp: smtp_tls_session_cache_timeout = 3600s
postfix: dict_load_fp: smtpd_tls_session_cache_database =
btree:/var/lib/postfix/smtpd_scache
postfix: dict_load_fp: smtpd_tls_session_cache_timeout = 3600s
postfix: dict_load_fp: smtpd_proxy_timeout = 300s
postfix: dict_load_fp: smtpd_tls_received_header = yes
postfix: dict_load_fp: smtpd_sasl_auth_enable = yes
postfix: dict_load_fp: broken_sasl_auth_clients = yes
postfix: dict_load_fp: smtpd_sasl_path = smtpd
postfix: dict_load_fp: smtpd_milters = inet:127.0.0.1:8891
postfix: dict_load_fp: non_smtpd_milters = $smtpd_milters
postfix: dict_load_fp: milter_default_action = accept
postfix: dict_load_fp: milter_protocol = 2
postfix: dict_load_fp: delay_warning_time = 30m
postfix: dict_lookup: syslog_facility = (notfound)
postfix: mac_parse: mail
postfix: dict_eval: const  mail
postfix: dict_update: syslog_facility = mail
postfix: dict_lookup: inet_protocols = all
postfix: mac_parse: all
postfix: dict_eval: const  all
postfix: dict_lookup: multi_instance_directories = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: multi_instance_directories =
postfix: dict_lookup: multi_instance_group = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: multi_instance_group =
postfix: dict_lookup: multi_instance_name = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: multi_instance_name =
postfix: dict_lookup: daemon_table_open_error_is_fatal = (notfound)
postfix: dict_update: daemon_table_open_error_is_fatal = no
postfix: name_mask: all
postfix: dict_lookup: myhostname = (notfound)
postfix: mac_parse: inet08.hamilton.harte-lyne.ca
postfix: dict_eval: const  inet08.hamilton.harte-lyne.ca
postfix: dict_update: myhostname = inet08.hamilton.harte-lyne.ca
postfix: dict_lookup: mydomain = (notfound)
postfix: mac_parse: hamilton.harte-lyne.ca
postfix: dict_eval: const  hamilton.harte-lyne.ca
postfix: dict_update: mydomain = hamilton.harte-lyne.ca
postfix: dict_lookup: mail_name = (notfound)
postfix: mac_parse: Postfix
postfix: dict_eval: const  Postfix
postfix: dict_update: mail_name = Postfix
postfix: dict_lookup: syslog_name = (notfound)
postfix: mac_parse:
${multi_instance_name:postfix}${multi_instance_name?$multi_instance_name}
postfix: mac_parse: postfix
postfix: dict_eval: expand
${multi_instance_name:postfix}${multi_instance_name?$multi_instance_name} ->
postfix
postfix: dict_update: syslog_name = postfix
postfix: dict_lookup: mail_owner = (notfound)
postfix: mac_parse: postfix
postfix: dict_eval: const  postfix
postfix: dict_update: mail_owner = postfix
postfix: dict_lookup: setgid_group = postdrop
postfix: mac_parse: postdrop
postfix: dict_eval: const  postdrop
postfix: dict_lookup: mydestination =
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_lookup: myorigin = (notfound)
postfix: mac_parse: $myhostname
postfix: mac_parse: inet08.hamilton.harte-lyne.ca
postfix: dict_eval: expand $myhostname -> inet08.hamilton.harte-lyne.ca
postfix: dict_update: myorigin = inet08.hamilton.harte-lyne.ca
postfix: dict_lookup: relayhost = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: relayhost =
postfix: dict_lookup: daemon_directory = /usr/libexec/postfix
postfix: mac_parse: /usr/libexec/postfix
postfix: dict_eval: const  /usr/libexec/postfix
postfix: dict_lookup: data_directory = /var/lib/postfix
postfix: mac_parse: /var/lib/postfix
postfix: dict_eval: const  /var/lib/postfix
postfix: dict_lookup: command_directory = /usr/sbin
postfix: mac_parse: /usr/sbin
postfix: dict_eval: const  /usr/sbin
postfix: dict_lookup: queue_directory = (notfound)
postfix: mac_parse: /var/spool/postfix
postfix: dict_eval: const  /var/spool/postfix
postfix: dict_update: queue_directory = /var/spool/postfix
postfix: dict_lookup: process_id_directory = (notfound)
postfix: mac_parse: pid
postfix: dict_eval: const  pid
postfix: dict_update: process_id_directory = pid
postfix: dict_lookup: inet_interfaces = localhost, inet08.hamilton.harte-lyne.ca
postfix: mac_parse: localhost, inet08.hamilton.harte-lyne.ca
postfix: dict_eval: const  localhost, inet08.hamilton.harte-lyne.ca
postfix: dict_lookup: proxy_interfaces = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: proxy_interfaces =
postfix: dict_lookup: double_bounce_sender = (notfound)
postfix: mac_parse: double-bounce
postfix: dict_eval: const  double-bounce
postfix: dict_update: double_bounce_sender = double-bounce
postfix: dict_lookup: default_privs = (notfound)
postfix: mac_parse: nobody
postfix: dict_eval: const  nobody
postfix: dict_update: default_privs = nobody
postfix: dict_lookup: alias_database = (notfound)
postfix: mac_parse: hash:/etc/aliases
postfix: dict_eval: const  hash:/etc/aliases
postfix: dict_update: alias_database = hash:/etc/aliases
postfix: dict_lookup: mail_release_date = (notfound)
postfix: mac_parse: 20140507
postfix: dict_eval: const  20140507
postfix: dict_update: mail_release_date = 20140507
postfix: dict_lookup: mail_version = (notfound)
postfix: mac_parse: 2.11.1
postfix: dict_eval: const  2.11.1
postfix: dict_update: mail_version = 2.11.1
postfix: dict_lookup: default_database_type = (notfound)
postfix: mac_parse: hash
postfix: dict_eval: const  hash
postfix: dict_update: default_database_type = hash
postfix: dict_lookup: hash_queue_names = (notfound)
postfix: mac_parse: deferred, defer
postfix: dict_eval: const  deferred, defer
postfix: dict_update: hash_queue_names = deferred, defer
postfix: dict_lookup: recipient_delimiter = +
postfix: mac_parse: +
postfix: dict_eval: const  +
postfix: dict_lookup: relay_domains = hash:/etc/postfix/relay_domains
postfix: mac_parse: hash:/etc/postfix/relay_domains
postfix: dict_eval: const  hash:/etc/postfix/relay_domains
postfix: dict_lookup: fast_flush_domains = (notfound)
postfix: mac_parse: $relay_domains
postfix: mac_parse: hash:/etc/postfix/relay_domains
postfix: dict_eval: expand $relay_domains -> hash:/etc/postfix/relay_domains
postfix: dict_update: fast_flush_domains = hash:/etc/postfix/relay_domains
postfix: dict_lookup: export_environment = (notfound)
postfix: mac_parse: TZ MAIL_CONFIG LANG
postfix: dict_eval: const  TZ MAIL_CONFIG LANG
postfix: dict_update: export_environment = TZ MAIL_CONFIG LANG
postfix: dict_lookup: import_environment = (notfound)
postfix: mac_parse: MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY DISPLAY
LANG=C
postfix: dict_eval: const  MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY
DISPLAY LANG=C
postfix: dict_update: import_environment = MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG
TZ XAUTHORITY DISPLAY LANG=C
postfix: dict_lookup: mynetworks_style = (notfound)
postfix: mac_parse: subnet
postfix: dict_eval: const  subnet
postfix: dict_update: mynetworks_style = subnet
postfix: dict_lookup: debug_peer_list = 216.185.71.25
postfix: mac_parse: 216.185.71.25
postfix: dict_eval: const  216.185.71.25
postfix: dict_lookup: default_verp_delimiters = (notfound)
postfix: mac_parse: +=
postfix: dict_eval: const  +=
postfix: dict_update: default_verp_delimiters = +=
postfix: dict_lookup: verp_delimiter_filter = (notfound)
postfix: mac_parse: -=+
postfix: dict_eval: const  -=+
postfix: dict_update: verp_delimiter_filter = -=+
postfix: dict_lookup: parent_domain_matches_subdomains = (notfound)
postfix: mac_parse:
debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps
postfix: dict_eval: const 
debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps
postfix: dict_update: parent_domain_matches_subdomains =
debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps
postfix: dict_lookup: alternate_config_directories = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: alternate_config_directories =
postfix: dict_lookup: bounce_service_name = (notfound)
postfix: mac_parse: bounce
postfix: dict_eval: const  bounce
postfix: dict_update: bounce_service_name = bounce
postfix: dict_lookup: cleanup_service_name = (notfound)
postfix: mac_parse: cleanup
postfix: dict_eval: const  cleanup
postfix: dict_update: cleanup_service_name = cleanup
postfix: dict_lookup: defer_service_name = (notfound)
postfix: mac_parse: defer
postfix: dict_eval: const  defer
postfix: dict_update: defer_service_name = defer
postfix: dict_lookup: pickup_service_name = (notfound)
postfix: mac_parse: pickup
postfix: dict_eval: const  pickup
postfix: dict_update: pickup_service_name = pickup
postfix: dict_lookup: queue_service_name = (notfound)
postfix: mac_parse: qmgr
postfix: dict_eval: const  qmgr
postfix: dict_update: queue_service_name = qmgr
postfix: dict_lookup: rewrite_service_name = (notfound)
postfix: mac_parse: rewrite
postfix: dict_eval: const  rewrite
postfix: dict_update: rewrite_service_name = rewrite
postfix: dict_lookup: showq_service_name = (notfound)
postfix: mac_parse: showq
postfix: dict_eval: const  showq
postfix: dict_update: showq_service_name = showq
postfix: dict_lookup: error_service_name = (notfound)
postfix: mac_parse: error
postfix: dict_eval: const  error
postfix: dict_update: error_service_name = error
postfix: dict_lookup: flush_service_name = (notfound)
postfix: mac_parse: flush
postfix: dict_eval: const  flush
postfix: dict_update: flush_service_name = flush
postfix: dict_lookup: address_verify_service_name = (notfound)
postfix: mac_parse: verify
postfix: dict_eval: const  verify
postfix: dict_update: address_verify_service_name = verify
postfix: dict_lookup: trace_service_name = (notfound)
postfix: mac_parse: trace
postfix: dict_eval: const  trace
postfix: dict_update: trace_service_name = trace
postfix: dict_lookup: proxymap_service_name = (notfound)
postfix: mac_parse: proxymap
postfix: dict_eval: const  proxymap
postfix: dict_update: proxymap_service_name = proxymap
postfix: dict_lookup: proxywrite_service_name = (notfound)
postfix: mac_parse: proxywrite
postfix: dict_eval: const  proxywrite
postfix: dict_update: proxywrite_service_name = proxywrite
postfix: dict_lookup: internal_mail_filter_classes = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: internal_mail_filter_classes =
postfix: dict_lookup: multi_instance_wrapper = (notfound)
postfix: mac_parse:
postfix: dict_eval: const
postfix: dict_update: multi_instance_wrapper =
postfix: dict_lookup: default_process_limit = (notfound)
postfix: dict_update: default_process_limit = 100
postfix: dict_lookup: max_use = (notfound)
postfix: dict_update: max_use = 100
postfix: dict_lookup: dont_remove = (notfound)
postfix: dict_update: dont_remove = 0
postfix: dict_lookup: line_length_limit = (notfound)
postfix: dict_update: line_length_limit = 2048
postfix: dict_lookup: hash_queue_depth = (notfound)
postfix: dict_update: hash_queue_depth = 1
postfix: dict_lookup: fork_attempts = (notfound)
postfix: dict_update: fork_attempts = 5
postfix: dict_lookup: deliver_lock_attempts = (notfound)
postfix: dict_update: deliver_lock_attempts = 20
postfix: dict_lookup: debug_peer_level = 32
postfix: mac_parse: 32
postfix: dict_eval: const  32
postfix: dict_lookup: fault_injection_code = (notfound)
postfix: dict_update: fault_injection_code = 0
postfix: dict_lookup: berkeley_db_create_buffer_size = (notfound)
postfix: dict_update: berkeley_db_create_buffer_size = 16777216
postfix: dict_lookup: berkeley_db_read_buffer_size = (notfound)
postfix: dict_update: berkeley_db_read_buffer_size = 131072
postfix: dict_lookup: header_size_limit = (notfound)
postfix: dict_update: header_size_limit = 102400
postfix: dict_lookup: header_address_token_limit = (notfound)
postfix: dict_update: header_address_token_limit = 10240
postfix: dict_lookup: mime_nesting_limit = (notfound)
postfix: dict_update: mime_nesting_limit = 100
postfix: dict_lookup: mime_boundary_length_limit = (notfound)
postfix: dict_update: mime_boundary_length_limit = 2048
postfix: dict_lookup: delay_logging_resolution_limit = (notfound)
postfix: dict_update: delay_logging_resolution_limit = 2
postfix: dict_lookup: tcp_windowsize = (notfound)
postfix: dict_update: tcp_windowsize = 0
postfix: dict_lookup: message_size_limit = 20480000
postfix: mac_parse: 20480000
postfix: dict_eval: const  20480000
postfix: dict_lookup: lmdb_map_size = (notfound)
postfix: dict_update: lmdb_map_size = 16777216
postfix: dict_lookup: disable_dns_lookups = (notfound)
postfix: dict_update: disable_dns_lookups = no
postfix: dict_lookup: soft_bounce = no
postfix: mac_parse: no
postfix: dict_eval: const  no
postfix: dict_lookup: owner_request_special = (notfound)
postfix: dict_update: owner_request_special = yes
postfix: dict_lookup: strict_8bitmime = (notfound)
postfix: dict_update: strict_8bitmime = no
postfix: dict_lookup: strict_7bit_headers = (notfound)
postfix: dict_update: strict_7bit_headers = no
postfix: dict_lookup: strict_8bitmime_body = (notfound)
postfix: dict_update: strict_8bitmime_body = no
postfix: dict_lookup: strict_mime_encoding_domain = (notfound)
postfix: dict_update: strict_mime_encoding_domain = no
postfix: dict_lookup: disable_mime_input_processing = (notfound)
postfix: dict_update: disable_mime_input_processing = no
postfix: dict_lookup: disable_mime_output_conversion = (notfound)
postfix: dict_update: disable_mime_output_conversion = no
postfix: dict_lookup: address_verify_negative_cache = (notfound)
postfix: dict_update: address_verify_negative_cache = yes
postfix: dict_lookup: backwards_bounce_logfile_compatibility = (notfound)
postfix: dict_update: backwards_bounce_logfile_compatibility = yes
postfix: dict_lookup: helpful_warnings = (notfound)
postfix: dict_update: helpful_warnings = yes
postfix: dict_lookup: send_cyrus_sasl_authzid = (notfound)
postfix: dict_update: send_cyrus_sasl_authzid = no
postfix: dict_lookup: multi_instance_enable = (notfound)
postfix: dict_update: multi_instance_enable = no
postfix: dict_lookup: enable_long_queue_ids = (notfound)
postfix: dict_update: enable_long_queue_ids = no
postfix: mac_parse: 100s
postfix: dict_eval: const  100s
postfix: dict_lookup: application_event_drain_time = (notfound)
postfix: dict_update: application_event_drain_time = 100s
postfix: dict_lookup: application_event_drain_time = 100s
postfix: mac_parse: 100s
postfix: dict_eval: const  100s
postfix: mac_parse: 100s
postfix: dict_eval: const  100s
postfix: dict_lookup: max_idle = (notfound)
postfix: dict_update: max_idle = 100s
postfix: dict_lookup: max_idle = 100s
postfix: mac_parse: 100s
postfix: dict_eval: const  100s
postfix: mac_parse: 3600s
postfix: dict_eval: const  3600s
postfix: dict_lookup: ipc_timeout = (notfound)
postfix: dict_update: ipc_timeout = 3600s
postfix: dict_lookup: ipc_timeout = 3600s
postfix: mac_parse: 3600s
postfix: dict_eval: const  3600s
postfix: mac_parse: 5s
postfix: dict_eval: const  5s
postfix: dict_lookup: ipc_idle = (notfound)
postfix: dict_update: ipc_idle = 5s
postfix: dict_lookup: ipc_idle = 5s
postfix: mac_parse: 5s
postfix: dict_eval: const  5s
postfix: mac_parse: 1000s
postfix: dict_eval: const  1000s
postfix: dict_lookup: ipc_ttl = (notfound)
postfix: dict_update: ipc_ttl = 1000s
postfix: dict_lookup: ipc_ttl = 1000s
postfix: mac_parse: 1000s
postfix: dict_eval: const  1000s
postfix: mac_parse: 10s
postfix: dict_eval: const  10s
postfix: dict_lookup: trigger_timeout = (notfound)
postfix: dict_update: trigger_timeout = 10s
postfix: dict_lookup: trigger_timeout = 10s
postfix: mac_parse: 10s
postfix: dict_eval: const  10s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: dict_lookup: fork_delay = (notfound)
postfix: dict_update: fork_delay = 1s
postfix: dict_lookup: fork_delay = 1s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: dict_lookup: deliver_lock_delay = (notfound)
postfix: dict_update: deliver_lock_delay = 1s
postfix: dict_lookup: deliver_lock_delay = 1s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: mac_parse: 500s
postfix: dict_eval: const  500s
postfix: dict_lookup: stale_lock_time = (notfound)
postfix: dict_update: stale_lock_time = 500s
postfix: dict_lookup: stale_lock_time = 500s
postfix: mac_parse: 500s
postfix: dict_eval: const  500s
postfix: mac_parse: 18000s
postfix: dict_eval: const  18000s
postfix: dict_lookup: daemon_timeout = (notfound)
postfix: dict_update: daemon_timeout = 18000s
postfix: dict_lookup: daemon_timeout = 18000s
postfix: mac_parse: 18000s
postfix: dict_eval: const  18000s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: dict_lookup: in_flow_delay = (notfound)
postfix: dict_update: in_flow_delay = 1s
postfix: dict_lookup: in_flow_delay = 1s
postfix: mac_parse: 1s
postfix: dict_eval: const  1s
postfix: dict_lookup: mynetworks = a.b.c.0/26, x.y.z.0/26, 127.0.0.0/8
postfix: mac_parse: a.b.c.0/26, x.y.z.0/26, 127.0.0.0/8
postfix: dict_eval: const  a.b.c.0/26, x.y.z.0/26, 127.0.0.0/8
postfix: inet_addr_list_append: ::1
postfix: inet_addr_list_append: 127.0.0.1

. . et al.

postfix: inet_addr_local: configured 6 IPv4 addresses
postfix: inet_addr_list_append: ::1
postfix: inet_addr_list_append: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
postfix: inet_addr_list_append: fe80::5054:ff:febf:e9ac
postfix: inet_addr_list_append: ffff:ffff:ffff:ffff::
postfix: inet_addr_list_append: fe80::5054:ff:fe77:f855
postfix: inet_addr_list_append: ffff:ffff:ffff:ffff::
postfix: inet_addr_local: configured 3 IPv6 addresses
postfix: inet_addr_list_append: 255.0.0.0
postfix: inet_addr_list_append: 255.255.255.0
postfix: inet_addr_list_append: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
postfix: dict_update: process_id = 4498
postfix: dict_lookup: sendmail_path = /usr/sbin/sendmail.postfix
postfix: mac_parse: /usr/sbin/sendmail.postfix
postfix: dict_eval: const  /usr/sbin/sendmail.postfix
postfix: dict_lookup: mailq_path = /usr/bin/mailq.postfix
postfix: mac_parse: /usr/bin/mailq.postfix
postfix: dict_eval: const  /usr/bin/mailq.postfix
postfix: dict_lookup: newaliases_path = /usr/bin/newaliases.postfix
postfix: mac_parse: /usr/bin/newaliases.postfix
postfix: dict_eval: const  /usr/bin/newaliases.postfix
postfix: dict_lookup: manpage_directory = /usr/share/man
postfix: mac_parse: /usr/share/man
postfix: dict_eval: const  /usr/share/man
postfix: dict_lookup: sample_directory = /usr/share/doc/postfix-2.11.1/samples
postfix: mac_parse: /usr/share/doc/postfix-2.11.1/samples
postfix: dict_eval: const  /usr/share/doc/postfix-2.11.1/samples
postfix: dict_lookup: readme_directory =
/usr/share/doc/postfix-2.11.1/README_FILES
postfix: mac_parse: /usr/share/doc/postfix-2.11.1/README_FILES
postfix: dict_eval: const  /usr/share/doc/postfix-2.11.1/README_FILES
postfix: dict_lookup: html_directory = no
postfix: mac_parse: no
postfix: dict_eval: const  no
--->

We are using pypolicyd-spf, opendkim, amavisd-new, clamav and spamassassin. 
These all seem to be working as expected.  The host is also handling a Mailman
installation.  It too seem to be working without any issues.

Any idea on how I can nail down what process is generating the malformed
socket error?

-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

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