Greetings, Long-time Postfix user, since the days of version 1. I have a server that is running Mailman on a CentOS 7 machine. Mailman has a couple lists that have quite a few digest users, so once a day, a blast of a bit under 1k messages go out. Have been running this for quite some time with really no issues.
However, lately, I got a complaint from a user who was not getting the Mailman digest. Mailman is set to personalize all messages, so it is not grouping any emails. I looked at the logs, and saw that indeed, a message was generated to the user, but Postfix never shows it being delivered. When a message is sent individually, I see the following logs: May 12 01:30:06 lists postfix/smtpd[17107]: DF1AC535BB: client=localhost[127.0.0.1] May 12 01:30:06 lists postfix/cleanup[17123]: DF1AC535BB: message-id=<mailman.1.1589261401.17114.l...@list.mydomain.com> May 12 01:30:06 lists postfix/qmgr[11268]: DF1AC535BB: from=<sac-bounces+user=userdomain....@list.mydomain.com>, size=6154, nrcpt=1 (queue active) May 12 01:30:17 lists postfix/smtp[17161]: DF1AC535BB: to=<u...@userdomain.com>, relay=cloudmail102.zonecybersite.com[43.227.231.102]:25, delay=11, delays=0.02/0/1.1/9.9, dsn=2.0.0, status=sent (250 OK) May 12 01:30:17 lists postfix/qmgr[11268]: DF1AC535BB: removed But more typically, I see only this: May 13 01:30:06 lists postfix/smtpd[1586]: 2D7D7185A2: client=localhost[127.0.0.1] May 13 01:30:06 lists postfix/cleanup[1589]: 2D7D7185A2: message-id=<mailman.1.1589347801.1577.l...@list.mydomain.com> May 13 01:30:06 lists postfix/qmgr[24766]: 2D7D7185A2: from=<sac-bounces+user=userdomain....@list.mydomain.com>, size=14168, nrcpt=1 (queue active) There is never a "sent" line, nor a "removed" line. In the above example, there is never any more references to 2D7D7185A2 in the rest of the log, nor is there anything in any of the queues. mailq does not show this message, neither does a check for the 2D7D file exist anywhere on the file system. Grepping thru the log also shows no other contact to the zonecybersite.com mailserver. There are no blocks in the firewall that would affect this. Again, if I send a message not during the big blast of digests, it goes thru fine. There's gigs and gigs of free disk space. I don't see any indications of insufficient memory, nor have I any other reports of missing mail delivery. I am running postfix from the Centos RPM: postfix-2.10.1-9.el7.x86_64 The output from postconf -n is: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/home/mailman/data/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 header_checks = regexp:/etc/postfix/header_checks html_directory = no ignore_mx_lookup_error = yes inet_interfaces = all inet_protocols = ipv4 mail_owner = postfix mailbox_command = /usr/bin/procmail -a "$EXTENSION" mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = lists.myserver.com lists.localhost, lists, localhost mynetworks = 1.2.3.4/24, 127.0.0.0/8, newaliases_path = /usr/bin/newaliases.postfix owner_request_special = no propagate_unmatched_extensions = canonical, virtual, forward queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES recipient_delimiter = + sample_directory = /usr/share/doc/postfix-2.10.1/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_destination_concurrency_limit = 3 smtpd_client_restrictions = reject_rbl_client sbl-xbl.spamhaus.org smtpd_helo_required = yes smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination reject_unlisted_recipient reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, reject_invalid_hostname, reject_non_fqdn_hostname, reject_unauth_destination check_policy_service unix:private/policyd-spf smtpd_sender_restrictions = reject_unknown_sender_domain, reject_non_fqdn_sender unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual, hash:/home/mailman/data/virtual-mailman postconf: warning: /etc/postfix/main.cf: unused parameter: policy-spf_time_limit=3600s What more can I look for? I really want to help this user, and it is baffling me why I can't see Postfix trying to deliver the email. Bob
