andrew at zope
Aug 20, 2004, 8:13 AM
Post #5 of 9
(1586 views)
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Tim Peters wrote:
> Probably best if you resend it. When mail.python.org and
mail.zope.org got
> divorced, it looks like m.p.o got custody of the children (i.e., m.p.o has
> gotten much better and m.z.o remained flakey).
mail.zope.org is not exactly "flakey" -- mailman gets hungup on
attempting to resend to failed deliveries (over and over and over). It
appears, as mailman runs it's outrunner, it goes over the list of
outfiles in the same order everytime, and gets tied up wasting time
trying to resend to failed deliveries (most of these are for domain
unknown). The failure of this is a 450, which is try again later. I've
looked to find a way to have this return a 550, but I cannot find a way
to do that. Due to the behavior of mailman, it spends most of it's time
attempting to redeliver these (~550 at the moment). We tried upping the
number of outrunner threads from the default of 1 which is way too low -
and this worked initially to clean out good deliveries, but then due to
the way mailman tries to lock the out files it gets itself into a
tailspin and loads down the server. We were able to keep good mail
running through with 15 outrunners, but then when all the good mail was
delivered the system would spiral into huge loads (27+) with mailman
swallowing up the server. I reduced these down to 5 outrunners, and the
tailspin (when it happens) isn't as bad - but it is loading the server
up as mailman contends and throws errors off locks and missing delivered
outfiles.
That said, I'm not sure the behavior of mailman if it's trying to send
out a large number of recipients in a single delivery to the mta - where
it fails due to the non-existent domains and all deliveries fail or what
it's behavior is. I also do not know if mailman has a knob like postfix
to kick failed deliveries out after a set time period. I thought
mailman was supposed to remove these addresses from the lists? Right
now, I see two huge offenders, but have no idea what list they are on or
I'd go remove them manually.
Since I don't have the time to figure out mailman to this degree and no
obvious hits have come up from googling. Both Jens and I have spent
time trying to fix this; but IMNSHO the problem is mailman or our lack
of knowing how to tweak it. If anyone knows the right tweaks to make,
I'd be glad to fix it since I believe I know what the problem is.
Andrew
>
>
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--
Zope Corporation
Software Engineer
(540) 361-1700
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