Hello,

I'm using 2.8.0. I've added a new transport in master.cf :

slow   unix  -       -       n       -       -       smtp
        -o syslog_name=slow

and the following in main.cf

slow_destination_rate_delay = 20
slow_destination_concurrency_limit = 3
slow_destination_recipient_limit = 2

and finally the following in my transport table :

wanadoo.fr      slow:

The issue is that I have only 1 message sent to wanadoo.fr every 20s, I 
expected to see 3 with this settings, so... what I am doing wrong ?

I have warnings like this one in logs that are certainly related to the issue :

warning: mail for wanadoo.fr is using up 1301 of 1500 active queue entries
warning: this may slow down other mail deliveries
warning: you may need to increase the main.cf 
slow_destination_concurrency_limit from 1
warning: please avoid flushing the whole queue when you have
warning: lots of deferred mail, that is bad for performance
warning: to turn off these warnings specify: qmgr_clog_warn_time = 0

I suspect something wrong with slow_destination_concurrency_limit because its 
value is 2 and the warning say to increase more than 1...

also postconf does not show those slow_* added values in main.cf, is this 
correct ?

Thanks for any tips,

Regards.

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