There seems to be a massive difference between the speed of various
providers, in terms of accepting messages for delivery. Yahoo stands out
as, by far, the slowest of the big ones.
Because the messages are legitimate, we signed up for the email feedback
loop with Yahoo, so that messages flagged as spam by Yahoo users are
reported back to us, so we can silence notifications for those accounts.
That didn't seem to help.
Messages @yahoo.com just accumulate in the deferred queue and stay there
for a long time. When they do get kicked back into the active queue,
it's just a trickle.
Everyone else's emails are delivered very quickly. It might be my
imagination, but it seems some providers do accept messages more quickly
if you use the email feedback loop.
Anyway, after a while, we end up with a bunch of @yahoo.com messages in
the queue, some domain typos, and not much else besides.
One of the tricks some people seem to use is creating a dedicated
transport for the slow destination. I'm reading the tuning and qshape
README documents, and there are a lot of good suggestions there, but I
was wondering what are the solutions that are being used *now*
specifically for dealing with Yahoo.
Thanks.
--
Florin Andrei
http://florin.myip.org/
