the quantity of deferred is yahoo response : this as that that is this Le vendredi 25 février 2011 à 15:29 -0800, Robert Goodyear a écrit : > On Feb 25, 2011, at 2:58 PM, Victor Duchovni wrote: > > > On Fri, Feb 25, 2011 at 02:38:16PM -0800, Robert Goodyear wrote: > > > >>> Have you seen problem relays in your upstream relay mix? What real > >>> symptoms do they exhibit and what is the observed impact on the upstream > >>> Postfix SMTP client? > >> > >> I'm going to run some analytics on my last 12 months' worth of outbound > >> messages to get more scientific with my gut instincts here. It's about 270 > >> million messages, and my observation is that when we have a spike of 4 or > >> 5 million that need to deliver at a certain point in time (surrounding a > >> critical/time-sensitive product launch) that my deferred queues saturate > >> too quickly. > > > > 20 million a month is a moderate mail flow if it is mail from ~50-100K > > users spread out over the day. I would then expect no more than ~1K > > messages in the deferred queue of each ~4 machines to be about the right > > quantity of deferred email. > > > > 4 million messages to deliver all at once is a very different problem. > > It is definitely a lumpy distribution -- probably 2 to 3 per month of ~4-5 > million to North American subscribers, interspersed with smaller regional > (outside North America) campaigns of 250-300K that sometimes coincide with > one of the big campaigns. Of course I could start building "stovepipes" in my > topology to isolate activity so one doesn't affect the other, but then > conversely I might have cold MTAs sitting idle when I could be using them. I > *do* have some regional points of presence where I have MTAs close to the > subscribers for their markets, e.g.: UK, EU and SE Asia; maybe I should > experiment with offloading deferred North America queues to them. I wonder if > their inherent latency would act as a rate limiter of sorts that would play > more nicely with recipient domains? > > Anyway I'm speculating... let me go crazy with SPSS and look for some > absolute patterns in the last year here. > > -- gpg --keyserver pgp.mit.edu --recv-key 092164A7 http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7
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