On Fri, Jan 08, 2010 at 03:24:25PM +0200, Patrick Chemla wrote:
> When I do telnet a139.localpc2105.com 25, I get immediate response.
What does "response" mean? Immediate connection completion means
nothing. Do you get a 220 banner right away? Do you get all of
it or just the first line in a multi-line banner, with the
rest arriving later?
> I have checked my local DNS. There were some troubles, and I made some
> improvements. I have now 2 local caching DNS respawning fast. All qmail
> servers addresses are in the postfix /etc/hosts to avoid Ip lookup.
> I have checked qmails servers, nothing has changed since they were able to
> have a queue of 200,000 messages, but they have now a few hundreds only.
> I have calculated average times to complete HELO. All qmails are in the
> same kind of value around 2 minutes.
Why the heck does it take 2 minutes to respond to HELO??? There's
your problem. Fix the qmail servers, to ensure that it takes a few
milliseconds to respond to HELO. Right now your HELO response is 3-4
orders of magnitude too slow.
Fix, probably involves as much removal of tweaks that are
counter-productive as adding specific changes to address the problem
(disable any rate controls that deliberately slow the sender, or
constrain resources).
Start debugging on the qmail side, find out what it is doing for 2
minutes...
--
Viktor.
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