Lately I have found that my outgoing queues are getting a little clogged for yahoo and sbcglobal.net. This usually coincides with a bulk set of news letters sent out from a couples clients. Typically we are seeing that they dump about 2000msg/per batch, with no more than one batch per week (usually on Friday nights). The problem is they do it in one fatal swoop. When this happens, we seem to get rate limited from yahoo/sbcglobal for a few hours, which directly affects our other users.
Some time ago I put a rate limiter in place for AOL/yahoo/sbcglobal/gmail so we wouldn't be bombarding but I don't think that it's being honored, probably because I missed something. When I do a postconf I don't see my rate limiter, which is in main.cf, listed there. I'm not sure if that's by design or part of a misconfiguration on my part. Mail goes out from different sets of servers, with the same public IP, so rate limiting will only affect the bulk mail queue. Is there something obvious that I missed? master.cf: ratelimit unix - - n - 3 smtp rate_limit_transport: aol.com ratelimit: yahoo.com ratelimit: sbcglobal.net ratelimit: gmail.com ratelimit: main.cf: ratelimit_destination_concurrency_failed_cohort_limit = 100 ratelimit_destination_concurrency_limit = 10 postconf -n: alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 html_directory = no mail_owner = postfix mailq_path = /usr/bin/mailq manpage_directory = /usr/share/man myhostname = ... mynetworks = /etc/postfix/custom/mynetworks newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.3/README_FILES sample_directory = /usr/share/doc/postfix-2.6.3/samples sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtp_tls_note_starttls_offer = yes smtp_use_tls = yes smtpd_client_restrictions = permit_mynetworks,permit_sasl_authenticated,reject smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_security_options = noanonymous smtpd_tls_cert_file = ... smtpd_tls_key_file = ... smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/custom/rate_limit_transport, hash:/etc/postfix/maps/transport unknown_local_recipient_reject_code = 550
