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
