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