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.