Hi, I'm trying to set up destination concurrency on our mail relay in an attempt to throttle email to freemail domains like google and yahoo. Mail is received to this server by two other postfix relays. Many users choose to forward their mail off to a remote account on google or O365 using a ~/.forward file.
I realize this causes problems with SPF and DKIM and forwarded mail, which is another problem I'd like to solve. postfix is saying I need to increase my initial_destination_concurrency_limit but I'm unsure if I'm setting this up correctly. I've followed the directions from here: http://steam.io/2013/04/01/postfix-rate-limiting/ Jan 6 19:52:58 cipher postfix/qmgr[446331]: warning: mail for gmail.com is using up 5540 of 5530 active queue entries Jan 6 19:52:58 cipher postfix/qmgr[446331]: warning: you may need to increase the main.cf turtle_destination_concurrency_limit from 1 Jan 6 19:52:58 cipher postfix/qmgr[446331]: warning: please avoid flushing the whole queue when you have Jan 6 19:52:58 cipher postfix/qmgr[446331]: warning: lots of deferred mail, that is bad for performance Jan 6 19:52:58 cipher postfix/qmgr[446331]: warning: to turn off these warnings specify: qmgr_clog_warn_time = 0 transport_maps = regexp:/etc/postfix/transport_limit default_destination_concurrency_limit = 10 # add a delay between each message to the same receiving domain default_destination_rate_delay = 1s # Limit the number of recipients of each message default_extra_recipient_limit = 10 polite_initial_destination_concurrency = 1 # number of paralell deliveries polite_destination_concurrency_limit = 3 # seconds between each set of messages polite_destination_rate_delay = 0 # number of recipients polite_destination_recipient_limit = 5 turtle_initial_destination_concurrency = 1 turtle_destination_concurrency_limit = 3 turtle_destination_rate_delay = 8s turtle_destination_recipient_limit = 4 I have entries in my transport_limit file similar to this: /aaahotelcompany\.com$/ turtle: and have the following in master.cf polite unix - - n - - smtp -o syslog_name=postfix-polite turtle unix - - n - - smtp -o syslog_name=postfix-turtle
