On 5/1/2010 9:43 PM, Gary Smith wrote:
This DOES NOT limit your delivery RATE!!
This limits only the delivery CONCURRENCY.
To limit the delivery RATE, see
http://www.postfix.org/postconf.5.html#transport_destination_rate_delay.
Looking into it now. Thanks for the pointer Wietse. If I'm running multiple
outgoing relays, does it make sense to have some type of concurrency rate for
the outgoing messages in this case?
As a general rule, reducing concurrency to the usual problem
domains is enough to keep mail flowing at a reasonable rate
(which is one reason I didn't address the concurrency vs. rate
delay issue). It's common for them to temporarily 4xx some of
the mail but eventually it all should go through, even with
default postfix settings.
You should sign up for "feedback loops" at each mail provider
if you haven't already. This may or may not give preference
to your mail, but is a necessary first step if you're doing
any kind of bulk mail.
If that still doesn't help, then implement the rate delay as
explained in the link Wietse gave you above. Read the link
carefully; the intent of the rate delay feature is to
significantly slow down mail delivery to the target domain.
And some domains will *still* 4xx some of the mail.
As far as multiple outgoing relays is concerned, the answer is
"maybe". The only way to know what works for *your* situation
is to try; first with the default settings, then reduce
concurrency to see if long-term delivery is any better. If the
average throughput of a mail run is significantly less than 1
delivery per second, implementing rate delays *may* allow you
to send more mail by not triggering evasive action at the
target mail server.
-- Noel Jones
