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fix destination concurrency

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Hi,
Postfix has this very peculiar behavior where the target of some config keys changes depending on the value. 
Here, if `smtp_destination_concurrency_limit` is set to 1, then according to http://www.postfix.org/postconf.5.html#default_destination_concurrency_limit it doesn't mean "1 concurrent mail per domain, but per recipiend address".

So, if set to 1, it means we can send any volume of e-mails concurrently (with a 5s delay) if all recipient addresses are different.
In order to avoid this, we should increase the value to restore the expected behavior (concurrency per domain, not per recipient).
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Julien Rabier 2020-05-11 21:37:17 +00:00 • committed by GitHub
parent b0136bd1aa
commit 7ccd6e1348
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data/templates/postfix/main.cf
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@ -170,7 +170,7 @@ smtpd_milters = inet:localhost:11332
milter_default_action = accept
# Avoid to send simultaneously too many emails
smtp_destination_concurrency_limit = 1
smtp_destination_concurrency_limit = 2
default_destination_rate_delay = 5s
# Avoid email adress scanning