On 06/27/2010 08:46 AM, Tim wrote: > > Where greylisting, typically, becomes a cropper is when some *BIG* > service like Yahoo tries to mail you, gets grey listed, and it spits the > dummy about not being able to post (some do get pernickity about it, > with a low threshold for suspending posts that didn't immediately get > through). > > Or, when it retries, the retry comes from a different server than the > first attempt, so that gets greylisted. And your message plays "hot > potato" through several different servers, each one getting separately > greylisted. If you're lucky, eventually it comes back through one that > your server will allow. If you're not, it'll go through so many > attempts that your server disallows it for taking too long, or their > server aborts attempting because each attempt gets disallowed. > > FWIW, in all of the installations if done these types of problems have never surfaced. I did specifically wonder about the second paragraph and I analyzed several months of logs from 4 high volume sites looking for an occurrence. Never found one. YMMV. Do you know of any MTAs able to share outbound queues that would account for this? -- You can get *anywhere* in ten minutes if you drive fast enough. 葛斯克 愛德華 / 台北市八德路四段
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