Am 22.03.2011 09:05, schrieb Kenneth Holter: > Hi all. > > I'm new to the list, and quite new to postfix. > > I'm running postfix 2.3 on one of my RHEL 5 servers, and have set up > postfix to forward all emails to our Microsoft Exchange > infrastructure. > On the server running postfix, I have an applications that > automatically generates emails. The issue I'm trying to solve is that > at times, the application generates enormous amounts of emails, > causing nearly a DoS attack on the Exchange servers. > > What I'd like to do is to have my postfix server rate limit the number > of emails it's forwarding to the Exchange servers. For example, if I > could get it to queue up emails, either on the inbound side or the > outbound side, and forward them on a steady rate, that would be great. > Note that all emails are generated locally on the server. > > Postfix seems to be a rather complex software, and I've not been able > to identify which component I should be tuning to accomplish rate > limiting. Any advice on this is greatly appreciated.
we are using this setting to only send one message per destination and second the problem is that "default_destination_rate_delay" only accepts whole seconds as delay and it depends on the count of messages if you can live with this, with < 10.000 mails per day 1 second delay for every destination is ok initial_destination_concurrency = 5 smtp_destination_concurrency_limit = 5 default_destination_recipient_limit = 15 default_destination_concurrency_limit = 5 default_destination_concurrency_failed_cohort_limit = 5 default_destination_rate_delay = 1 transport_retry_time = 30 if there are too messages for wait a second maybe you should set concurrency even lower and disable rate_delay
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