Dear Postfix Experts: I am having difficulties delivering newsletters to comcast.net email addresses and ask for some advice. I have set aside a special transport for the IP (using sender_transport) as it is new without an established reputation. When a queue run is begun, comcast.net will allow 50 messages to be sent before it begins deferring (see message below). The trouble is that Postfix only genuinely attempts to deliver messages to comcast.net every 50 minutes; the queue manager says that it attempts deleveries every 5 minutes, but I think it is just repeating the deferral messages that it already received. It is almost as if the minimal_backoff_time that was defined in the custom transport is not overriding the default setting in main.cf.
I would like to have it make a 'genuine' attempt more frequently. With a deferred queue of 6,000 messages, this will take forever. Any suggestions would be greatly appreciated. Thanks! Best, Steve The default configuration is overridden by a custom transport in master.cf as below. The postfix version is 2.9.4 ------------------------------------ $>postconf -c /etc/postfix-br -n authorized_submit_users = command_directory = /usr/sbin config_directory = /etc/postfix-br daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix-br 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 default_destination_concurrency_limit = 20 default_process_limit = 230 fast_flush_domains = mydomain.net html_directory = no inet_protocols = ipv4 mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man master_service_disable = maximal_queue_lifetime = 5d minimal_backoff_time = 45m multi_instance_enable = yes multi_instance_name = postfix-br newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix-br readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES sample_directory = /usr/share/doc/postfix-2.6.6/samples sender_dependent_default_transport_maps = hash:/etc/postfix-br/sender_transport.txt sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_bind_address = 185.64.153.201 smtp_helo_timeout = 100s syslog_name = br-shared unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/var/custom/virtual.txt,regexp:/var/listpilot/virtual_custom.regexp ------------------------------------ $>cat /etc/postfix-br/master.cf ... acct_client1 unix - - n - - smtp -o syslog_name=br-client1 -o smtp_bind_address=185.94.24.84 -o smtp_helo_name=news.client1.org -o smtp_destination_concurrency_limit=2 -o smtp_destination_recipient_limit=5 -o smtp_destination_rate_delay=1s -o initial_destination_concurrency=2 -o minimal_backoff_time=300s -o acct_client1_destination_concurrency_failed_cohort_limit=200 ... ------------------------------------- Sample log Message when throttling kicks in: May 2 16:37:25 mail4 br-client1/smtp[4599]: 2277ACEC472: to=< pers...@comcast.net>, relay=mx1.comcast.net[96.114.157.80]:25, delay=400519, delays=400503/11/4.7/0, dsn=4.0.0, status=deferred (host mx1.comcast.net[96.114.157.80] refused to talk to me: 421 resimta-po-10v.sys.comcast.net comcast 185.94.24.84 Throttled - try again later. pYdN1s02k1ors0201 Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000002)
