Hi Phil, On 21.01.2017 02:39, Phil Pennock wrote: > On 2017-01-20 at 16:52 +0100, Patrick Cernko wrote: >> When a mail is sent over this list, exim creates a new smtp connection >> for every mail it gets from mailman. > > What you want to do is have Exim "queue" the file instead of attempt an > immediate delivery, and do a two-stage routing pass where in the first > stage it goes over every message figuring out what should go where. > This populates the wait hints databases, so on the second pass the Exim > delivery process can check for "what other mails need to go here" and > grab those. > > Easiest way to use two-stage queue runners is to use "-qq" instead of > "-q" on the command-line. Eg, `exim -bd -qq2m` (what I run with). > > Myself, on my personal server, my main section has: > > queue_smtp_domains = lsearch;RUNCONFDIR/smtp_queue > > where that file contains a list of domains which are always queued; you > might just put the big domains in that; with -qq2m you'll delay all > mails to those domains by up to two minutes. That gets you out of > immediate trouble and lets you figure out which way to go next. > > Simpler but less effective would be to use the queueing options; if > you're not comfortable writing ACLs yet then this might be for you. > > There are a whole bunch of queuing options in The Exim Specification; > you should be able to find some tuning options to help you find a better > balance. > > * 14.10 Resource control > * Search for "queue" under > > https://www.exim.org/exim-html-current/doc/html/spec_html/ch-main_configuration.html#SECTalomo > + 14.21 Routing and delivery > > > More effective: change one of the ACLs (acl_smtp_mail or somesuch) to > have a step which: > > 1. Checks if the mail is sent from the local host (whichever IP applies > for mailman). > 2. Checks via `senders` if the address looks like a mailman message, > pattern-matching on -bounces- or whatever it is that appears. > 3. Apply `control = queue_only` to matching messages. > > This is the most effective, since it's an exact match, but takes a > little more experience. >
Thanks very much for the detailed help. Obviously I have to learn more about the tuning possiblities for outgoing traffic, in the past, I had to focus mostly on incoming stuff for spam protection, ... As the server is dedicated for mailman lists, I could use a rather simple approch from your suggestions: "queue_smtp_domains = *" together with -qq1m and suitable retry rules now does the job very well. Thanks so much for the quick and very detailed answer! -- Joint Administration Information Services & Technology Patrick Cernko
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