My setup was
default_destination_concurrency_limit = 1
default_destination_recipient_limit = 25
I never had major problems with this, it was only a little bit slow with
gmail, yahoo and other big mail accounts providers, anyway never a real
issue.
This setup is probably not perfect if you have a lot of mail users, as
one single mail with a lot of recipients will slow-down the delivery
until all the "sub-deliveries" are handled for a specific server.
Marco
Il 19. 05. 17 16:02, richard lucassen ha scritto:
On Fri, 19 May 2017 15:52:05 +0200
marco <marco.brign...@marcobaldo.ch> wrote:
So if I understand the docs correctly, setting this parameter to
e.g.default_destination_concurrency_limit = 1 25 has the following
result:
1 message sent to 100 rcpt's -> postfix -> 4 messages to 25 rcpt's
Note: 100 rcpt's at the same domain of course.
Right or wrong?
Correct, however 25 was a good number only if
default_destination_concurrency_limit is set to 1, as i.e. if you
have 2 you can have 2*25 recipients delivered in parallel and some
servers have been not happy with this.
Ah, that might be the issue then, when I leave these parameters
set to their defaults, it would mean that the maximum Postfix will send
at once is 20 mails containing 50 recipients?
So, according to you I should add:
smtp_destination_concurrency_limit = 1
to main.cf.
R.
