Re: email is fast!

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- --On Wednesday, February 07, 2007 23:21:21 +0100 Magnus Hagander
<magnus(at)hagander(dot)net> wrote:

>>>> Well, yeah, it's much better, and quite often it is that fast. And then
>>>> suddenly something happens and you have a 4-6 hour delay on a couple of
>>>> mails, while others go through. But the speed-when-things-are-working is
>>>> good, yes :-P
>>> Being a fairly new lurker to the Postgresql lists, what is the reason for
>>> the speed delay? I, too, have a 3-5 hour delay, but I thought it was
>>> something to do with my end and greylisting. Now I'm not sure . . . :/
>>
>> Just to follow up this one ... Kevin sent me an email including the full
>> headers for one that took 12 hours to be delivered ... using the QUEUE ID, I
>> checked the logs and it turns out that the mail server couldn't resolve the
>> MX the first and second time it tried to deliver, but succeeded on the
>> third ...
>
> This sounds scaringly close to the problem we had on wwwmaster with it
> not delivering emails. Resolving separately looked fine, but sendmail
> couldn't resolve.
> Could it be symptoms of the same problem?

Does postfix do any 'caching of results'? For instance, if it got a failed
response, would it cache that and re-use that later, pending it timing out in
its own cache? So try 1 failed, try 2 used cache and failed, try 3 was after
cache timed out and re-tried, at which point the local DNS server had the right
value ...

- ----
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