My remote concurrency is 500, so that's not a problem. In what I've seen
and you have to understand, I'm just an admin here, I really have nothing
to do with the "quality" of the mail addresses that come through
here. That's a story within itself, but out of 2 million emails, 40% of
those on average are deferred. That's a lot of emails sitting getting
retried, I've often seen my remote concurrency consist completely of
deferral retries, especially of for some reason qmail need to be restarted
or something...so if it has to sort through 800,000 mails that may get
deferred again, that's wasted time and resources.
There are a number of things I know I can do, nothing is balanced
currently, but what I think would be nice is have the deferral host be
load balanced across a few deferral machines, keeps those messages off the
main mailers and we don't really care what happens to the deferred
messages as long as they don't restrict outgoing mail.
I know I have options, but a deferral host just seems like it would be a
"nice thing" to have available.
-jeremy
> Jeremy Hansen <[EMAIL PROTECTED]> wrote:
>
> >Hmm, but qmail does get bogged down by deferrals from my experience.
>
> Not like sendmail does, though. qmail's quadratic backoff on retries
> helps, as do its overall higher efficiency and its table of
> nonresponding hosts (see "man qmail-tcpto").
>
> >I can't really see how it cannot, through just the fact that it has
> >to log future deferred attempts, etc.
>
> Logging with multilog is very cheap.
>
> >If you have a very large amount of mail that's constantly getting new
> >messages for outgoing, those deferred messages when retried take up a
> >qmail-remote process that could be dedicated to an actual deliverable mail
> >instead of retrying something that was deferred and may get deferred again.
> >I'd like slow mail, deferred or whatever on a host that's dedicated to
> >retrying and not getting new mail.
>
> If you've got a spare host, why not split the load? What's the
> advantage of shuffling deferred messages from one server to another?
> That's a pretty expensive operation, even for qmail.
>
> >Even when new mail stops, qmail sits
> >there and tries to deliver deferred mail until queuelifetime is
> >exceeded. Why not have a host dedicated to those types of mails instead
> >of bogging down your main mail machine.
>
> Most folks don't find deferred messages such a burden. They use up a
> few qmail-remote's and some space in the queue, but that's no big
> deal. Have you bumped up concurrencyremote to account for deferalls?
>
> >In my case it seems lke it would be useful. I'm delivering 1 - 2 million
> >messages a day and a large percentage of that gets deferred.
>
> ``Profile. Don't speculate.''
>
> What percentage of messages are deffered? How many attempts, on
> average, does it take to deliver them? How much burden would be
> shifted by delivering them to a fallback host after the first
> deferral? Would a fallback host configuration be more
> efficient/faster/more effective than a dual-host configuration?
>
> -Dave
>
http://www.xxedgexx.com | [EMAIL PROTECTED]
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