Really, thank you for your patience :) I have difficulty understanding perfectly English...
> No, the *process* limit of "3" is implemented in master(8), which spawns >processes on demand, up to the process limit. The concurrency limit (parallel >deliveries to a single destination domain) is enforced in the queue-manager. >The >queue manager concurrency limit is a maximum, the actual concurrency will be >lower when the master(8) daemon process limit is reached, or mail arrival is >not >high enough to reach peak concurrency. So in my conf : + transport : zedomain.tld slow: + main.cf : transport_maps = hash:/etc/postfix/transport slow_destination_concurrency_limit = 2 + master.cf : slow unix - - n - 3 smtp -o smtp_connection_cache_on_demand=no Can i replace the '3' with a '-' like this : slow unix - - n - - smtp -o smtp_connection_cache_on_demand=no I'm really confused about this configuration... I can't find the right optimized configuration... To know DNS informations about zedomain.tld SMTP servers, I executed this command : user# dig smtp.zedomain.tld A I have 10 responses (round robin) : ;; ANSWER SECTION: smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x01 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x02 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x03 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x04 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x05 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x06 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x07 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x08 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x09 smtp.zedomain.tld. 471 IN A xxx.xxx.xxx.x10 I know (and i tested) each smtp.zedomain.tld servers can only accept 3 max concurrency connections : 3 for the xxx.xxx.xxx.x01, 3 for xxx.xxx.xxx.x02, etc. So I could make up to 30 concurrency connections but i would like to force 3 per servers. If i configure like this : + main.cf : slow_destination_concurrency_limit = 30 + master.cf : slow unix - - n - - smtp -o smtp_connection_cache_on_demand=no is it good ? If i have 22 mails for zedomain.tld, 'smtp's should send mails to the smtp.zedomain.tld in this order (with the smtp_connection_cache_on_demand=no option): mail #01 -> xxx.xxx.xxx.x01 mail #02 -> xxx.xxx.xxx.x02 mail #03 -> xxx.xxx.xxx.x03 mail #04 -> xxx.xxx.xxx.x04 mail #05 -> xxx.xxx.xxx.x05 mail #06 -> xxx.xxx.xxx.x06 mail #07 -> xxx.xxx.xxx.x07 mail #08 -> xxx.xxx.xxx.x08 mail #09 -> xxx.xxx.xxx.x09 mail #10 -> xxx.xxx.xxx.x10 mail #11 -> xxx.xxx.xxx.x01 mail #12 -> xxx.xxx.xxx.x02 mail #13 -> xxx.xxx.xxx.x03 mail #14 -> xxx.xxx.xxx.x04 mail #15 -> xxx.xxx.xxx.x05 mail #16 -> xxx.xxx.xxx.x06 mail #17 -> xxx.xxx.xxx.x07 mail #18 -> xxx.xxx.xxx.x08 mail #19 -> xxx.xxx.xxx.x09 mail #20 -> xxx.xxx.xxx.x10 mail #21 -> xxx.xxx.xxx.x01 mail #22 -> xxx.xxx.xxx.x02 ??? Thanks -- Myrdhin,
