Postfix: rate & connection control£¿

Chowroc · 11-14-2005, 09:06 PM

I have done some rate control for postfix:

Code:

# initial_destination_concurrency = 1
default_destination_concurrency_limit = 1
smtp_destination_concurrency_limit = 1
in_flow_delay = 4s
default_process_limit = 80
maximal_queue_lifetime = 10d
# default_destination_recipient_limit = 20

Thus I think the rate to a destination such as example.com would be:
60/$in_flow_delay = 15 letters/min

But in the maillog, I still found many "too many letters during this connection" messages. I lookup the postfix documentation, and I think these parameters have influences:
smtp_connection_reuse_time_limit (300s)
smtp_connection_cache_reuse_limit (10s)
smtp_connection_cache_time_limit (2s)
default_destination_recipient_limit (50)

I'm not very clear about the parameters, the smtp_connection_reuse_time_limit availabe for postfix-2.3, my verstion is postfix-2.2.5, but when I add
smtp_connection_cache_reuse_limit = 5s
These 2 parameters was not highlight in editor and when I reload postfix, I found in the maillog that they are "bad" parameters. But the documentation says it's available after 2.2.

What is wrong?

And I want to know if $initial_destination_concurrency > $default_destination_concurrency_limit, what will happen?

Thanks.

Chowroc · 11-16-2005, 02:41 AM

I know, smtp_connection_cache_reuse_limit is the limit of times, not the limit of time, so it should be 5, not 5s.

But where I found "too many letters during this connection" in log, I also found that the mail was bounced. If I don't want the mail to be bounced but just deferred, What can I do?

Thank you.