[pfx] Re: Trying to limit the number of users per connection and the number of concurrent connections to one domain

On Fri, Jun 26, 2026, at 2:57 PM, Wietse Venema wrote:
> Paul Tomblin via Postfix-users:
>> slow_smtp_destination_concurrency_limit = 2
>> slow_smtp_destination_recipient_limit = 5
>
> Those names don't exist. Try these:

I don't understand why you say they don't exist. Doesn't my master.cf line create one?

I can see slow_smtp when I do
# postconf -M | awk '{print $1}' | sort -u
anvil
bounce
cleanup
defer
discard
error
flush
lmtp
local
pickup
policyd-spf
postlog
proxymap
proxywrite
qmgr
relay
retry
rewrite
scache
showq
slow_smtp
smtp
tlsmgr
trace
verify
virtual

>
>     slow_destination_concurrency_limit
>     slow_destination_recipient_limit
>
> The postconf command should complain about your unused parameters.

It doesn't complain about anything.

# postconf |grep slow
slow_smtp_delivery_slot_cost = $default_delivery_slot_cost
slow_smtp_delivery_slot_discount = $default_delivery_slot_discount
slow_smtp_delivery_slot_loan = $default_delivery_slot_loan
slow_smtp_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
slow_smtp_destination_concurrency_limit = 2
slow_smtp_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
slow_smtp_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
slow_smtp_destination_rate_delay = $default_destination_rate_delay
slow_smtp_destination_recipient_limit = 5
slow_smtp_extra_recipient_limit = $default_extra_recipient_limit
slow_smtp_initial_destination_concurrency = $initial_destination_concurrency
slow_smtp_minimum_delivery_slots = $default_minimum_delivery_slots
slow_smtp_recipient_limit = $default_recipient_limit
slow_smtp_recipient_refill_delay = $default_recipient_refill_delay
slow_smtp_recipient_refill_limit = $default_recipient_refill_limit
slow_smtp_transport_rate_delay = $default_transport_rate_delay



-- 
Paul Tomblin
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