On Thu, Mar 05, 2009 at 04:21:01PM +0100, Santiago Romero wrote:
>
>> Please wait for an updated patch, we believe we have identified the
>> cause and reproduced the symptoms (in that order). I have a candidate
>> patch, but I expect Wietse will send an updated more polished version
>> in the not too distant future.
>>
>
> Ok, I'll wait for it. I'm going to roll back to "ubuntu packages" (I
> already applied the patch and was testing it).
>
>> The original 2.5.x code is correct for "oqmgr", but not for "qmgr"
>> (aka "nqmgr"), which requires additional internal state adjustments
>> when destinations are blocked and unblocked
>
> I've changed to "oqmgr" in master.cf for the machine that uses that special
> "slow" transport. Would I notice any difference in postfix behaviour
> because of using "oqmgr" instead of "qmgr" (less performance or something
> like that)?
With "oqmgr", "list" messages with a lot (multiple thousands to perhaps
hundreds of thousands) of recipients can dominate the queue, and delay
small messages. Also if you don't define "relay_domains" correctly,
on a high-volume border gateway outbound "smtp" traffic can "starve"
inbound "smtp" traffic when both use the same transport, especially
if outbound traffic exhibits high latency.
- Avoid mixing (very large) "list" mail with regular traffic in
the same queue with "oqmgr"
- Avoid delivering inbound/outbound traffic via the same transport.
- Avoid outbound congestion caused by lack of recipient validation.
--
Viktor.
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