Hi I thinking about destination_rate_delay and destination_concurrency_limit. I read documentations and I don't known how this really works
example: default in postfix is: default_destination_concurrency_limit=20 - This means that postfix will up to two concurrent connections per receiving domains. default_destination_rate_delay =0 - Postfix will add a delay between each message to the same receiving domain. I change for this: default_destination_concurrency_limit = 10 default_destination_rate_delay = 1s Some users send e-mail from: u...@domena1.ltd to us...@domena1.ltd (emails employees) (I have one server to outgoing and One server to incomming e-mail - total many many domains and e-mails) Normal mailq (before changing) is ~500 After changing mailq up to 5K (most email is for this same domain - default_destination_concurrency_limit) example Oct 29 10:57:31 smtp1 postfix/smtps/smtpd[32557]: 4CMLTR1TRGz5wNQ: client=public-gprs401074.centertel.pl[37.47.197.243], sasl_method=LOGIN, sasl_username=u...@domena.ltd Oct 29 10:57:31 smtp1 postfix/cleanup[42103]: 4CMLTR1TRGz5wNQ: message-id=<026a01d6add9$e9d5f4f0$bd81ded0$@u...@domena.ltd> Oct 29 10:57:31 smtp1 postfix/qmgr[1377]: 4CMLTR1TRGz5wNQ: from=<u...@domena.ltd>, size=62937, nrcpt=1 (queue active) Oct 29 11:34:35 smtp1 postfix/qmgr[47280]: 4CMLTR1TRGz5wNQ: from=<u...@domena.ltd>, size=62937, nrcpt=1 (queue active) Oct 29 11:36:11 smtp1 postfix/qmgr[1403]: 4CMLTR1TRGz5wNQ: from=<u...@domena.ltd>, size=62937, nrcpt=1 (queue active) Oct 29 11:37:05 smtp1 postfix/qmgr[3334]: 4CMLTR1TRGz5wNQ: from=<u...@domena.ltd>, size=62937, nrcpt=1 (queue active) Oct 29 11:54:50 smtp1 postfix/smtp1/smtp[3925]: 4CMLTR1TRGz5wNQ: to=<user2...@domena.ltd>, relay=mx.domain1.ltd[xxx.xxx.xxx.xxx]:25, delay=3440, delays=2375/1035/30/0.03, dsn=2.0.0, status=sent (250 ok 1603968890 qp 8669 by mx1.dmain1.ltd) Oct 29 11:54:50 smtp1 postfix/qmgr[3334]: 4CMLTR1TRGz5wNQ: removed Why Postfix doesn't send 1sc email upon entering qmgr and push to mx: Postfix push to mx after 1h .... I thought that in this configuration, postfix will send every 1s to the same domain like: 10:57:31 in --> 10:57:32 --> out But I can see these emails were fighting for time resources.... Why is it doing - because I want to slow down traffic to * .outlook.protect.com somehow Because when I change the IP to a new one, outlook.protect.com limits them and only after 5-6 hours returns to normal .... --
