On Thu, Oct 19, 2017 at 11:26:48AM +0200, Charlie Elgholm wrote:
> > slow_queue:
> > driver = accept
> > condition = ${if queue_running}
> > condition = ${run{/bin/sleep 30}{yes}{no}}
> > no_verify # Don't execute during ACL verification
> > unseen # Pass message to next router even though we've accepted
> >
> > Bit of a hack but combined with strict queue-runner limits seems like it
> > could work to effective throttle. Haven't tested, maybe some pitfalls?
>
> Uh... Sorry.. Haven't had my morning coffee (and it's 11.21 AM here in
> Sweden now!), but, I don't understand what this would accomplish... I
> like the emails being generated from my database system to be queued
> for delivery by Exim, I don't want my database-system to wait for each
> message before it's put in the queue. Depening on what function where
> talking about there's usually 100 to 50k unique messages generated for
> the users. I rather have my database perform other jobs then spooling
> to Exim for a hour or two. ;)... Or... Have I missunderstood this
> completely? Do the routers get executed AGAIN when Exim handles the
> queue?? I thought they were just executed on receiving a message..
Routers get reprocessed in their entirety every time a message is considered
for delivery, so yes. This makes sense because MX records can change over
lifetime of a message in queue, configuration changes affecting routing might
change while in queue, etc.
During a queue run it will either (a) run every message through their routers
before delivering *any* of them, or (b) individually as it moves through the
queue. Depends if your queue runner has been given the "-q" or "-qq" command
line options.
The "no_verify" makes sure the router is skipped during initial reception in
the ACL phase. You can force all emails to be queued for certain domains with
the global "queue_smtp_domains = *"
On your smtp transport you may need to set combination of
"connection_max_messages", "remote_max_parallel" and "max_rcpt" so that Exim
doesn't cheat and try and send a large number of messages down a single or
parallel connections.
Haven't tested or tried any of this, just thinking outloud and comparing to
some of our other configs.
Thanks,
Dean Brooks
[email protected]
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